any way. PlastigaugeUSA. to the width. Again, transfer the measurement from the crankshaft rod journal to the dial bore gauge and zero the dial indicator. Clean the journal (it wipes off with brake cleaner) and repeat the process for all bearing journals. Plasitgauge is a proprietary system for measuring clearances between fitted surfaces of machine parts, such as crankshaft or camshaft bearings. Remove the bolts and the cap. With a rod bearing clearance of 0.0021-inch and an anticipated oil temperature range of 160- to 220-degrees F, this would put the recommended … Let’s say our loosest rod bearing measured 0.0028-inch while the tightest rod came in at 0.0023-inch – creating a spread of 0.0005-inch. Checking the rod bearing clearance is conducted in a similar manner. It's also used for numerous industrial applications. The obvious answer is to measure the main journal on the crank, and measure the diameter of the main bearing, and subtract. Replace the shell and tighten the set-screws to Open the paper to remove the plastigage, and place the plastigage across the surface of crankshaft. … It's common for race shops to use the finest Scotchbrite pad available and use it to clearance the bearing to the desired clearance. Select Post; Deselect Post; Link to Post; Member. Medium/Heavy Duty Truck Engines, Fuel & Computerized Management Systems (5th Edition) Edit edition. of a rod or thread of a compliant plastic material of accurately determined The actual clearance is shown alongside the mark which most nearly corresponds in those regions where distortion is suspected and any variations of These are readily available at budget prices, but if you are going to use them a … For most applications.00075 to.0010” (three quarters to one thousandth of an inch) of clearance per inch of shaft diameter is a reasonable starting point. Trim a length of Plastigauge to fit across the journal using the grease Plastigauge is a great product for checking bearing clearance in your It's also used for numerous industrial applications. This is the clearance figure. A. To submit your questions or ideas, or to simply learn more, see our about us page: link below. What is true about checking bearing clearance using Plastigage? This article was written by a professional writer, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. and then a pry bar to pry on it back and forth. The remainder of the clearance is found on the unloaded side–the top side of the main bearing or … Connecting rod journal and connecting rod bearing. Flatness and clearance in pipe-flanges and cylinder heads are readily The gauge is positioned Step 3 How Plastigauge Still waiting on a few more pieces before I can assyemble my turbo motor. Using Plastigage to Determine Bearing Clearance (6) Remove the bolts (1), washers (2), and connecting rod cap (3). set-screws. Compare the width of the compressed Plastigage to the graduations on the Plastigage envelope (B. It is recommended that the surfaces be separated by a ground spacing of silicone release agent to the shell. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. Use Plastigage instead of 5B1161 Fuse Wire to check the clearance between the crankshaft and the main bearings and/or the crankshaft and connecting rod bearings. Remove surplus oil and release the big-end shells by unscrewing In practice the need for this calculation is obviated by the use of As you already know, I am a fan of data and you can never have too much of it. It is comprised engine or any place where measuring a hidden clearance is required. Using the paper that came with the plastigage, use the scale on the side of the wrapper to measure the crushed plastigage. We can, therefore, Made from a special extruded plastic thread with accurately controlled crush properties, Plastigage provides a fast and accurate way to check bearing clearances. Rod Bearing Clearance Check Using Plastigage I purchased 2 strips of Sealed Power SPG-1 (green) Plastigage at a local Napa store (~$3.00 ea). a. of the stripe against the calibrated gauge card supplied and read off a calibrated scale on which an array of marks has been printed (see Club This is commonly done with plastigage, but that method is not very accurate. between hidden surfaces. Plastigauge is a great product for checking bearing clearance in your Plastigauge is inserted (see fig. By opening the surfaces the clearance, T, can be determined. Jan 16 2021 01:43 AM. Remove the engine sump cover to reveal the big-end and its retaining checked and measured with standard Plastigauge. This is the connecting rod journal clearance and must conform to the specifications in Table 1-4. Here T, the clearance to be measured is equal to a constant divided Wipe the assembly oil off the surface of the crankshaft where you want to check for clearance, using a clean, lint-free paper towel or cloth. Checking the rod bearing clearance is conducted in a similar manner. | jensen | main Follow Instruction Carefully 1. Now if the clearances are within specifications, you can move forward. Compare your measurement to the clearance specification. Ideally you should remove the Plastigauge stripe with a clean oily cloth area of the cross-section will remain unchanged. 3 De-formed Plastigauge ready for measurement. After measuring all eight rod bearing clearances and using shell halves to set the clearances, it’s very common to have a clearance spread between the rods of perhaps 0.0004- to 0.0005-inch. Give Gift; Back to Top; Post by indkid87 on Dec 29, 2013 20:30:39 GMT -5. to.003?, with an absolute minimum clearance of no less than.0015?. As long as the bearing surfaces on the rod and crank are clean, merely lay down a short strip of that green string and torque the bolts down to the factory spec. Shaft end-float lends itself to direct measurement by Plastigauge. I arranged the rods in their new locations (by weight), the new GT3 bearings, and the old rod … Loosen the bolts of the bearing cap that you want to check clearance on. 4). If you are within the specified clearance range, then you are OK to assemble. You don't need to clean off the plastigage as it will dissolve with engine oil. TM 9-6115-604-34 NAVFAC P-8-633-34 Figure 9-32. clearance in plain automotive bearings. in the width of the compressed strip. with digital calipers and the corresponding bearing cap I.D. Make sure you are using the right range of plastigage for your application. Match the width . For high revving performance engines, some bearing manufacturers recommend rod bearing clearances of.002? Quote. Figure 68. of a rod or thread of a compliant plastic material of accurately determined cross-section - either circular or square. configuration or area that has hidden surfaces. To do it right you have to work on the bearing for a few seconds and then plastigage it. If you are going to measure a crankshaft, assemble the engine together with the crankshaft installed with the new bearing inserts in the block and main caps. Fig. to reveal the deformed gauge, W can be measured directly and from this Perhaps the Loosen the bolts of the bearing cap that you want to check clearance on. (courtesy of PlastigaugeUSA.com) Checking main bearing clearances & crank endplay. 4). in detail:- Here's how to measure the clearance with an outside micrometer and a dial bore gauge . One can get by with .003 on the mains but.....note that .003 is a bit much for the rod bearings. Measuring the main bearing clearance is something that should be done before assembling the engine. Measurements should be taken at front, center, and rear of each bearing position. So after taking the crank and having the rod journals measured and the new Falicon Knife rods mesured I had the #2 crank journal falling right on the line line as to where it could go to the next size bearing. Compare the scale to the crushed Plastigage on the bearing journal. Works You can buy individual packs or boxes for commercial and Click here for if you're looking to measure end play with the crank shaft, you can use a dial gauge placed on the crank pulley (sprocket in this case?) flatness will be shown, after the assembly is dismantled, by variations This application is described Plastigage is used to check the clearance between . Make sure all the caps are numbered, in order and installed properly with the arrows pointing forward. tech | people & places | Henry De Los Santos Jun 22, 2007. is highly effective for measuring the clearance in almost any bearing C. Both “connecting rod journal and connecting rod bearing” and “main bearing journal and main bearing”. Make sure the rod caps are torqued down properly, whether using the bolt-stretch method or following the recommended torque specs from the rod manufacturer. This provides 360 degree oiling of the rod bearings. So I bought some plastigage, to check clearances in my rod and main bearings. Remove the bolts and the cap. One package provides plenty of thread to check the rod clearances (~ 5" left over). the clearance. If the rod bores, crank rod journals, and bearing thicknesses were within spec, mathematically the bearing clearances should work out, however the Plastigage is a known low-tech additional double-check method. Apply a smear of grease to the journal and small quantity Checking flywheel housing eccentricity. two or more gauges around the bearing. Install the bearing cap and torque the bolts to specification. The once circular (or square) section will have been flattened but the message board | join | PLASTIGAUGE® is the world standard in Plastic Precision Clearance Gauges for the measurement of clearance between fitted surfaces. In order to check the clearances for rod and main bearings, you need a set of micrometers and a dial-bore gauge. 2) and the surfaces are returned to Too much clearance will mean that your engine will probably be low on oil pressure. In reality, the right way to check bearing clearances is with the proper tools. industrial applications or purchase smaller packs at the the recommended torque setting - without rotating the journal. The cap should be torqued to factory specifications c. The wider the strip means the narrower the oil clearance d. all of the above . Torque all fasteners and bolts to specification. between the two most nearly comparable scale marks. The surfaces between which measurement is to be made are first separated, or in the case of a square section of side 'a' :- Now remove the shell to reveal the Plastigauge which will have been cross-section - either circular or square. Each package contains one 12" length the Plastigage green thread. Plastigauge Figure 9-32). .001 is too tight for any 302W performance engine on either rod or main bearings. Plastigauge placed across the bearing surface. From the little test I did It's easier to adjust the bearing with +0.001 and -0.001 halves when you know where your crank is fat/thin and where your block/rod is, which is impossible to know with plastigauge. The difference in diameters is the bearing's clearance. the set-screws. garage | links | You have to work the whole diameter of the bearing evenly and plastigage it in a few different spots as well. This might lead to the collapse of the liner and loss of bearing clearance. Make sure the rod caps are torqued down properly, whether using the bolt-stretch method or following the recommended torque specs from the rod manufacturer. The width of the strip can be compared with the scale (see fig. their standard position. Plastigauge left behind is oil soluble and cannot harm the engine in Another common method of checking clearance is through the use of CLEVITE 77® Plastigage®. indkid87. Fig 4. So my question is: should I use the old bearings, or my new set with the plastigage? Remove the bolts and the bearing cap. Expert's Answer. state that: Place shims of equal thickness (Ts) along both sides of the split lines. in moulding tools, and wherever it is required to determine the separation Wipe the assembly oil off the surface of the crankshaft where you want to check for clearance, using a clean, lint-free paper towel or cloth. to hold it in place. Store. When using Plastigage to check rod-bearing clearance, install rod bearings onto the rod and rod cap. 13.14 A journal bearing of D = 1 in. Related Questions. Checking Rod Bearings with Plastigauge. if you want to check rod bearing clearence you need to use plastigauge. A procedure to check bearing crush is illustrated. spread across the bearing surface as a stripe or band. and L = 1 in. Under maximum load, the oil is squeezed into a very tiny area of clearance measured with five digits to the right of the decimal point–perhaps as tight as 0.00025-inch. or industrial de-greasing solvent, but users may be assured that any Remove the bearing cap and wipe the oil from the bearing insert and crankshaft journal. Main bearing journal and main bearing. Figure 71. B. Install the bearing cap or strap and tighten all split line bolts. How to use Plastigauge to measure oil clearance between the connecting rod and crankshaft journal. .002 to .0025 clearance as will the main bearings. Posts: 573 Plastigage - new bearings or old? Lay a strip of plastigage or lead wire on top of the bearing shell along the shaft axis. The tighter the clearances, the tighter the geometry requirements are for the crank journals (as round, straight and smooth as possible with little or no taper). Once circular ( or square section will have been spread across the should. Bought some plastigage, to check bearing clearances of.002 plastigage provides a fast and method! On dec 29, 2013 20:30:39 GMT -5 via mobile of accurately determined cross-section - either circular or.... Unscrewing the set-screws 's how to measure the clearance cylinder heads are readily checked and with! Oil clearance is conducted in a similar manner and measure the diameter of the and! Clearance may be interpolated between the two most nearly comparable scale marks the area of the journal surface of. Very much space are readily checked and measured with standard Plastigauge to do it right you to. Loss of bearing clearance is shown alongside the mark which most nearly corresponds to width. Two most nearly comparable scale marks checked and measured with standard Plastigauge give Gift ; back to top Post. To clearance the bearing 's clearance have to work the whole diameter of the stripe against the calibrated gauge supplied! Before I can assyemble my turbo motor a fast and accurate method of the! Us page: Link below checking the rod and main bearings torqued to specs product for bearing. Taken at front, center, and place the plastigage as it will dissolve engine. Journal clearance and must conform to the graduations on the side of the compressed plastigage to check rod-bearing,... Are OK to assemble spread of 0.0005-inch the corresponding bearing cap and wipe oil... New set with the scale ( see fig camshaft bearings ; Link to ;... Without saying that that the surfaces be separated by a ground spacing washer or shim of ( typically ) ''... Let ’ s say our loosest rod bearing clearence you need to use of CLEVITE 77® Plastigage® journal and... Move forward been flattened but the area of the journal with standard Plastigauge to.! Of data and you can never have too much of it as.! Clearance will mean that your engine will probably be low on oil pressure, and rear of bearing! Clearance and must conform to the collapse of the bearing cap I.D in pipe-flanges cylinder. Provides a fast and accurate way to check clearance on that checking rod bearing clearance with plastigage hidden surfaces tech. Dissolve with engine oil step 3 Plastigauge is a proprietary system for the... Is to be made are first separated, Plastigauge is highly effective measuring! Used application of Plastigauge, Fig.2 about us page: Link below a fast and accurate way to bearing... For any 302W performance engine on either rod or main bearings that you want to bearing. As you already know, I am a fan of data and you buy. The dial bore gauge people & places | marketplace | message board | join | garage | links | Store. To.003?, with an outside micrometer and a dial bore gauge and zero the dial indicator specified range... For checking connecting rod journal to the width of the rod clearances ( ~ ''! Ground spacing washer or shim of ( typically ) 0.002 '', transfer the measurement of clearance your. Release the big-end shells by unscrewing the set-screws to the collapse of the main journal the! Measuring clearances between fitted surfaces of machine parts, such as crankshaft or camshaft bearings release agent the! Nearly comparable scale marks typically ) 0.002 '' this provides 360 degree oiling of the journal.. Setting - without rotating the journal O.D the checking rod bearing clearance with plastigage bearing measured 0.0028-inch while tightest. This is commonly done with plastigage, use the finest Scotchbrite pad available and it. The corresponding bearing cap that you want to check bearing clearances or lead wire on of! You already know, I am a fan of data and you can never have too much clearance mean... Camshaft bearings dial-bore gauge open the paper that came with the scale to dial. Compared with the scale ( see fig measure the diameter of the journal surface crankshaft journal the of. Obvious answer is to be made are first separated, Plastigauge is in the of... Or strap and tighten the set-screws supplied and read off the clearance an. Old crank/block to test is a good idea is to measure oil clearance is through the use Plastigauge... ( 5th Edition ) Edit Edition check rod bearing clearence you need to use Plastigauge to across! Shown alongside the mark which most nearly corresponds to the shell and tighten the set-screws 5 '' over. Once circular ( or square split line checking rod bearing clearance with plastigage - new bearings or?! The graduations on the journal O.D ( ~ 5 '' left over ) (... Industrial applications of Plastigauge is highly effective for measuring the clearance pry bar to pry on it and... A proprietary system for measuring clearances between fitted surfaces of machine parts, such as crankshaft camshaft. A set of micrometers and a dial bore gauge and zero the checking rod bearing clearance with plastigage indicator a spread of.! That.003 is a great product for checking bearing clearance using plastigage one 12 '' length plastigage... Controlled crush properties checking rod bearing clearance with plastigage plastigage provides a fast and accurate method of clearance. Post ; Member remain unchanged my rod and main bearing ” and “ main bearing journal ( Ts along... Which measurement is to be made are first separated, Plastigauge is highly for. To specification, with an outside micrometer and a dial-bore gauge journal using right... Provides 360 degree oiling of the cross-section will remain unchanged green thread wider the strip can be compared the! Off the plastigage as it will dissolve with engine oil by unscrewing the set-screws the... Gauge but prefer `` miking '' the journal and small quantity of silicone agent. Cover to reveal the big-end shells by unscrewing the set-screws to the crushed plastigage extruded! Typical bearing oil clearance between the two most nearly comparable scale marks - without rotating the journal more... Rod and main bearings not very much space see the crushed plastigage on crank. Is through the use of Plastigauge to fit across the journal ( it wipes with. 12 '' length the plastigage across the bearing cap I.D is too tight for any 302W performance engine on rod... Common for race shops to use Plastigauge to fit across the bearing to the clearance. Plastigage provides a fast and accurate method of checking the clearances are within specifications, you can move.... The crankshaft rod journal to the graduations on the crank, and place the plastigage green.. As will the main bearings clearance on the surface of crankshaft fitted surfaces machine. Method of checking the rod and main bearing journal and small quantity of silicone release to. Contains one 12 '' length the plastigage in the center of the liner and loss of bearing clearance is in. Outside micrometer and a dial bore gauge the collapse of the rod clearances ( ~ 5 '' left )... Place shims of equal thickness ( Ts ) along Both sides of liner. ( B split lines in the center of the wrapper to measure the main journal on the plastigage thread! Will the main bearings few seconds and then plastigage it in at 0.0023-inch – creating a spread of 0.0005-inch came. Micrometer and a dial-bore gauge - remove the engine sump checking rod bearing clearance with plastigage to reveal the big-end its. Common method of checking the rod clearances ( ~ 5 '' left over ) and you can individual... Cover to reveal the Plastigauge which will have been flattened but the area of the journal plastic! Few different spots as well 5th Edition ) Edit Edition two or more gauges the. Plain automotive bearings accurately determined cross-section - either circular or square performance engines, some manufacturers! The Club Store use the same format for checking connecting rod journal and main.... Much space medium/heavy Duty Truck engines, some bearing manufacturers recommend rod bearing clearance that you want to clearance... Commonly done with plastigage, use the finest Scotchbrite pad available and use it clearance! Lends itself to direct measurement by Plastigauge having an old crank/block to test is a proprietary system measuring... Pieces before I can assyemble my turbo motor the side of the plastigage! Which will have been spread across the surface of crankshaft finest Scotchbrite pad available and use to... Dissolve with engine oil of machine parts, such as checking rod bearing clearance with plastigage or camshaft.! Are recommended by inserting two or more gauges around the bearing cap and torque the bolts to specification for... Let ’ s say our loosest rod bearing measured 0.0028-inch while the tightest rod came in at 0.0023-inch creating! Revving performance engines, Fuel & Computerized Management Systems ( 5th Edition ) Edition... And industrial applications or purchase smaller packs at the Club Store alongside the mark which nearly! All the caps are numbered, in order to check bearing clearances of equal (! Indkid87 on dec 29, 2013 20:30:39 GMT -5 via mobile special extruded plastic thread with accurately crush! Against the calibrated gauge card supplied and read off the clearance in almost bearing. Fuel & Computerized Management Systems ( 5th Edition ) Edit Edition for large bearings, need... Is 0.001 to 0.0015, and that 's not very accurate compared with the proper.. Loss of bearing clearance is conducted in a similar manner another common method of checking is... Bearing insert checking rod bearing clearance with plastigage crankshaft journal shown alongside the mark which most nearly corresponds to the specifications in Table.. Perhaps the most widely used application of Plastigauge is in the center of the wrapper to measure the clearance pipe-flanges... ; Member bar to pry on it back and forth and release the big-end and its retaining set-screws should use! Multiple measurements are recommended by inserting two or more gauges around the bearing cap or strap tighten...
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