Crankcase, Crankshaft, Main Bearings & Flywheel

2.Apply sealant (Teflon tape) / lubricant to male NPT threads (Pre-applied dry sealant are preferred over other sealants). With any sealant, the first one to two threads should be let uncovered to avoid system contamination. If PTFE tape is used it should be wrapped 1.½ to 2 turns in clockwise direction when viewed front the pipe thread end.

More than two turns of tape may cause distortion or cracking of the port.

3.Screw the connector into the port to the finger tight position.

Checking Compression

Use compression gauge to check compression in all cylinders of the engine individually. (It is advisable to check cylinder compression before overhauling. Comparison of these figures will disclose errors or show improvements.)

To check the cylinder compression, screw in a plug port adapter in place of the injector of the respective cylinder and connect with compression. Draw up both connections tight.

Close the vent valve of the compression gauge and crank the engine briefly by means of the starting motor. Only a few cycles of the engine are required to obtain a satisfactory reading. After taking the reading retard the pointer on the dial all the way by opening the vent valve. Close the valve again and repeat the check to make sure that the reading is correct.

4.Wrench tighten the connector to the appropriate T.F.F.T. Values shown in the table A, making sure that the tube end of a shaped connector is aligned to receive the incoming tube or hose assembly. Never back off (loosen) pipe threaded connectors to achieve alignment.

5.If leakage persists after following the above steps, check for damaged threads and total number of threads engaged.

If threads on the fitting are badly nicked or galled, replace the fitting. If port threads are damaged, re-tap, if possible, or replace the component. If the port is cracked, replace the component.

Check compression in all cylinders of the engine as described above. The compression shown on the gauge is 16½ atu. (235 lbs. per sq. in.) each graduation mark being 2 atu. (28½ lbs. per sq. in.). With the engine warmed up, normal compression in the cylinders is 16 to 18 atu. (228 to 256 lbs. sq. in.) at the speed of 100 r.p.m. (starting motor speed).

Compression pressure should be nearly equal in all four cylinders of the engine. When a reading is taken that deviates considerably from the above specifications, as for example 14 atu. (200 lbs. p. sq. in.) and below, the cause must be determined and the trouble remedied.

Check for leaking valves, faulty piston rings and worn pistons or cylinder sleeves.