Continental L-Head Overhaul Manual - Igor Chudov

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2. The 3 piece oil ring should be installed first on the piston, from the top side so skirt will not be scratched. Figure |37--Install Tapered Rings with "Top" Side Up 3. TO install the balance of the rings, use a ring tool with recess side up and place the ring in with the bottom side up. Start with the lowest ring first. Some piston rings are taper faced. These are clearly marked "TOP" on the side to be up when assembled on piiston. 4. Position ring in the tool so the expanding fingers will fully engage both ends. 5. Apply pressure on handles so ring is completely expanded. Pass the expanded ring and tool recessed side down over the piston to the proper groove. CAUTION if piston is equipped with a steel groove insert, this must be installed on top of the number one ring. (The steel groove insert is not part of the re-ring kit ~ this can be re-used when replacing rings.) 6. Check the ring side clearance at various positions with a feeler in accordance with the tolerances shown on the Limits and Clearance Chart. Figure 138--Checking Ring Clearance in Groove CONTINENTAL L-HEAD ENGINE MANUAL Page 61 CRANKSHAFT AND MAIN BEARINGS 1. Using a puller, remove pulley from crankshaft. 2. Take out screws and remove gear cover. 3. Drop the oil pump, by removing nut or cap screws holding pump to center main bearing cap. GEAR PULLER CRANK GEAR Figur.e 138A m Removing Crank Gear 4. Remove each main bearing cap, one at a time, and inspect the bearing and crankshaft journals. If there is any indication of flaking out, scoring or actual wear, -- they must be replaced. BEARINGS Some models use tri-metal bearings which when new are smooth and highly polished. However, a very few hours of operation will change their appearance completely. The bearing surface becomes a leaden gray in color and develops minute craters, almost cellular in appearance as indicated in the photograph, which follow the pattern of the matrix. This appearance is a natural characteristic of this type bearing’ and in no way indicates failure. Figure 139 ~ Appearance of a Good Bearing
Page 62 CONTINENTAL L-HEAD ENGINE MANUAL Figure 140 m Bearing Damage Due to Corrosion Figure 141 --Scored Bearing Due to Dirt or Lack of Oil 5. If the visual inspection appears satisfactory, they should be removed and checked for thickness using a ball micrometer. Figure 142 ~ Removing Main Bearing To remove the upper half of the bearing shell use a special tool obtainable at most parts houses, which is a pin with an angular head. It may be inserted in the oil hole of the crankshaft and as the crankshaft is turned in a clockwise direction, the head of this pin picks up the bearing shell and forces it out of the bore in the block. Figure 143 ~ Measuring Bearing Thickness The thickness of the bearing shells is given in the Limits and Clearance Chart, and if this thickness has been reduced more than .0005 beyond the maximum allowable tolerance the bearing shell must be replaced. 6. If visual inspection of the crankshaft shows no indication of excessive wear or scoring, the clearance of the feeler should be checked. Figure 144- Checking Bearing Clearance with Plastigauge 7. Check each bearing, one at a time, by using a piece of Plastigage of a diameter specified to check certain clearances. By placing this Plastigage in the bearing and tightening it in place, the width of the Plastigage after crushing determines the bearing clearance as shown above. CAUTION When using this method DO NOT TURN the crankshaft as that would destroy the Plastigage.
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CONTINENTAL L-HEAD OVERHAUL MANUAL
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QUICK REFERENCE SECTION INDEX First
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SECTION VII ~ IGNITION CONTINENTAL
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Page 2 CONTINENTAL L-HEAD ENGINE MA
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SIX CYLINDER L-HEAD ENGINES* M 0 D
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Continental L-Head Overhaul Manual - Igor Chudov

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