Installation Instructions for Oversize Piston and Ring Sets
1. The following procedure is necessary prior to reboring and honing the cast iron sleeve, part no. 8N‑6055‑B, to fit oversize piston and ring assemblies.a. Determine which oversize piston assembly is required by measuring the diameter of the cylinder bore at its largest diameter (top of ring travel) by using an inside micrometer or telescope gauge and outside micrometer. 2. Install a cylinder boring machine on the cylinder block. a. Cover the crankshaft with an oil soaked cloth.
b. Set the diameter of the cutting tool so that the cylinder bore will be .002” undersize to allow for honing the bore for the specified piston fit.
c. The following are part numbers and mean diameters for service piston assemblies.
PISTON ASSEMBLIES
8N‑6110‑D---3.2080 Dia.---.020 O.S.
8N‑6110‑E---3.2180 Dia.---.030 O.S.
8N‑6110‑F---3.2280 Dia.---.040 O.S.
3. To obtain the required piston fit to cylinder bore of 5 ‑ 10 pounds pull using a .002 x ½" ribbon and the specified sleeve finish for proper ring seating, the following procedure is recommended. a. Use a rigid type hone and No. 220 grit stones. A drill with a speed range of 250‑450 R.P.M. should be used to drive the hone. The stones must be dry when used to obtain the desired cylinder sleeve finish. NOTE: The speed of the hone and rapidity of the stroke governs the cross hatch marks on the sleeve. The cross hatch marks should intersect at approximately 90° for proper ring seating. b. Operate the hone through the bore 10-12 complete strokes. Remove the hone, clean the sleeve with dry rags, and recheck the piston fit.
c. Repeat the above procedure, until the necessary amount of material has been removed for the specified piston to bore fit. CAUTION: Do not use gasoline or kerosene to clean the sleeve walls after the honing operation. Solvents of this type will not remove the abrasives but will further embed small abrasive particles into the pores of the cylinder block. NOTE: If valve seats need refacing, this should be done previous to cleaning the cylinder block. 5. Clean the cylinder block of all foreign material as follows: a. Wipe or remove as much of the abrasive material as possible.
b. Swab each sleeve wall, valve port and chamber with clean SAE 10 motor oil at least twice.
c. Wipe the oil out of sleeves with clean rags.
d. Wash the sleeve bores and valve chambers with hot soapy water.
e. Flush water jackets to remove foreign material which might cause excessive wear to the water pump.
f. Remove the rags from the crankshaft and wash the crankshaft with hot soapy water.
g. Dry the cylinder block thoroughly, using compressed air. 6. Reassemble the engine with reference to Service Bulletin Number 182, dated October 5, 1951.
Hope this helps..... ..... Ed
'52 8N475798
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