Oiling Problems

Trouble Shooting Your Twin Cam from Fueling pumps.


LOW OIL PRESSURE

1. Pressure gauge not reading properly – double check with another mechanical PSI gauge
2. Pressure relief valve in camplate sticking or not seating properly / see Feuling camplate PSI test tool Part #9010
3. Camplate scored at oil pump mounting surface
4. Pressure gears and or housing scored from trash running through oil pump
5. Camplate top plug not sealing
6. Camplate leaking at oil passages – warped camplate
7. Pinched O-ring(s)
8. Excessive run out in pinion shaft
9. Miss alignment – center camplate to pinion shaft then oil pump to pinion shaft by rotating engine over

NO OIL PRESSURE

1. Air lock – fill oil filter full of oil
2. Missing plug in camplate (boss vs. no boss)
3. Broken gears - Gears & housings not lubed properly during install, excessive run out in pinion shaft
4. Pressure relief valve stuck wide open in camplate – see Feuling camplate PSI test tool Part #9010

BLOW – BY

1. Oil level too high
2. Sub seal not installed properly
3. Scavenge gears and or housing scored from debris running through oil pump
4. Flapper valves in breathers stuck
5. Pinched O-ring(s)
6. FLT – 6 speed trans with dipstick in rear of trans can allow more oil to be added to oil tank and not show on dipstick
7. Excessive RPM on rev limiter
8. Excessive leak down – Vent oil tank – see Feuling’s oil tank breather kits

WET SUMPING

1. To verify if engine is wet sumping run engine to operating temp. then shut down and pull the allan head plug from very bottom of engine case. Measure oil and if more than 6oz. drains then there is a wet sumping issue.
2. Sub seal miss aligned
3. Oil level too high
4. Scavenge gears and or housing scored from trash running through oil pump
5. Out of tolerance scavenge side of oil pump
6. Return oil passages plugged
7. Pick-up hole in crankcase plugged
8. Vent oil tank – see Feuling’s oil tank breather kits

DIPSTICK BLOW OUT

1. Rocker housing gaskets wrong or installed improperly
2. Oil level too high
3. Excessive leak down – run a cylinder leak down test
4. Vent oil tank – see Feuling oil tank breather kits

NOISY VALVE-TRAIN

1. Lifter bore to lifter clearance too large
2. Low oil pressure
3. Pushrod’s flexing - hitting pushrod tubes
4. Roller rocker arms
5. Valve springs hitting bottom rocker housing
6. Pushrod oil hole plugged
7. Pushrod oil hole plugged
8. Leaky/broken piston cooling jets