Trouble Shooting

FEULING® TWIN CAM ENGINE TROUBLE SHOOTING GUIDE

Having oiling, noise or sumping issues with your Twin Cam engine: please review the following trouble shooting guide that Feuling has compiled over the years to help assist you.

* ALWAYS CHECK YOUR OIL PRESSURE - WHAT IS YOUR OIL PRESSURE COLD? HOT?

LOW OIL PRESSURE

  1. Check and verify engine oil level.
  2. Pressure gauge not reading properly – double check with another mechanical PSI gauge
  3. Pressure relief valve in camplate leaking, sticking open or not seating properly – see Feuling camplate PSI test tool Part #9010
  4. Pinched Oil Pump O-ring(s)
  5. Loose camplate/oil pump bolts, stripped camplate 'dowel pin' bolts
  6. Camplate scored at oil pump mounting surface, pressure gears and or housing scored from debris running through oil pump
  7. Camplate top plug not sealing, camplate leaking at oil passages – warped camplate
  8. Excessive crankshaft pinion shaft run out causing oil cavataion
  9. Intermittent oil psi loss on bagger/FL models during hard acceleration - oil tank baffle shifted & blocking oil pick up hole
  10. Mis alignment of oil pump – center camplate to pinion shaft then oil pump to pinion shaft by rotating engine over while tightening bolts
  11. Leaky piston cooling jets
  12. Leaky camplate hydraulic tensioners ('07-'17 Including '06 Dyna models) when tightening outer tensioner push tensioner toward chain
  13. '99-'06 leaking fittings and or issue with the 90 degree rubber oil lines, sucking/pulling air. Oil line broken on the inside causing a "flapper valve"

NO OIL PRESSURE

  1. Check and verify engine oil level
  2. Pressure relief valve stuck open in camplate – see Feuling camplate PSI test tool Part #9010
  3. Missing plug in camplate face (boss vs. no boss)
  4. Air lock in oiling system – fill oil filter full of oil - If this is the initial engine start up
  5. Broken oil pump gears - gears & housings not lubricated properly during install, debris running through engine, excessive crankshaft run out, excessive play in crank bearings, excessive end play, loose, improperly installed or issue with compensating sprocket.
  6. Broken/loose piston cooling jets
  7. Stock oil pump installed on Feuling HighFlow camplate
  8. Blocked pick up part in oil tank. Possible debris from prior failure

WET SUMPING / BLOW - BY

  1. To verify if engine is wet sumping, run engine to operating temperature then shut down and pull the allen head plug from bottom ofengine case. Measure oil and if more than 5oz. drains from the sump then there is a wet sumping issue.
  2. Oil level too high - run oil level no more than 3/4 - 7/8 full cold, check oil level per owner's manual
  3. Sub seal of oil pump mis aligned with the scavenge port hole of the engine case.
  4. Piston rings not seated, causing oiling system cavitations, run a cylinder leak down test - Vent oil tank - Feuling's oil tank breather kits
  5. Scavenge gears and or housing scored from debris running through oil pump causing out of tolerance scavenge side of oil pump
  6. Excessive run out in pinion shaft - causing oil pump/system cavitation
  7. Pinched Oil Pump O-ring(s)
  8. FL/Baggers – 6 speed trans with dipstick in rear of trans can allow more oil to be added to oil tank and not show on dipstick
  9. Excessive RPM on rev limiter, de-seated rings
  10. Flapper valves in breathers stuck
  11. Return oil passages plugged, pick-up hole in crankcase plugged
  12. '99-'06 leaking fittings and or issue with the 90 degree rubber oil lines, sucking/pulling air

DIPSTICK BLOW OUT

  1. Oil level too high, run oil level 3/4 - 7/8 full cold
  2. Rocker housing gaskets are wrong or installed improperly
  3. Excessive cylinder leak down – run a cylinder leak down test
  4. Breather valves in rocker boxes installed incorrectly, it's common to find them installed upside down with the flapper below the element
  5. Spark knock, piston detonation, rings not seated or coming un-seated under hard acceleration
  6. Excessive RPM on rev limiter, de-seating rings
  7. Vent oil tank – see Feuling oil tank breather kits
  8. Use conventional oil over syntenic for better ring/cylinder seal

NOISY VALVE-TRAIN

  1. Lifter to lifter bore clearance too large, Feuling recommends a clearance of 0.001" - 0.0015" for proper lifter performance – see tool #9004 and oversized lifter #'s 4051, 4052
  2. Pushrods flexing and hitting pushrod tubes - look for a shiny ring witness mark around pushrod normally seen towards the cylinder head
  3. Low oil pressure
  4. Rocker arms/bushings out of tolerance
  5. Valve spring to camshaft combination creating valve-train separation – See Feuling Beehive valve springs
  6. Clearance for roller rocker arms on underside of rocker box cover
  7. Steep ramped camshafts, valves closing so fast the valves bounce off valve seats – See Feuling® Beehive® valve springs
  8. Pushrod center oil hole plugged

ENGINE NOT ROATING

  1. Pinched O-ring in oil pump
  2. Burr on oil pump gear eliminating the side clearance of oil pump, pump locks up as soon as bolts get tight
  3. Debris inside oil pump teeth, binding gears
  4. Dry oil pump housing and gears
  5. Gear drive cams on 07-17 not installed correctly, possible use of washer behind rear cam gear

FEULING® M-EIGHT ENGINE TROUBLE SHOOTING GUIDE

OIL LEVEL - DO NOT OVERFILL OIL TANK

It is important to get the correct hot oil level in your bike. Feuling recommends running the oil level 90%-99% full when hot.

Note: The oil pick up port is on the right side of the engine. Letting the bike idle or warm up on the kickstand will naturally fill the engine case and skew the oil level in the tank.

We recommend the following steps to achieve proper oil level:

  1. Check cold oil level.
  2. Ride the bike until operating temperature is reached.
  3. Shut the bike off while still in the upright position. (This insures an accurate reading)
  4. Once the bike is on the kickstand check oil level.
  5. Add or remove oil as needed

SUMPING

  1. Oil level too high – see above
  2. To verify if engine is wet sumping, ride motorcycle under normal riding conditions up to operating temperature, shut off engine before sitting down on kick stand. With bike straight up pull the ¼ allen head plug from bottom of engine case. Measure oil, a healthy engine with a Feuling oiling system should see between 3-6oz. If more oil is present address oil level and all other steps below.
  3. Detonation, check tune, fuel, exhaust/intake leaks
  4. Blow by through rings and cylinders, perform a leakdown test
  5. 1/4 NPT sump plug screwed in too deep on bottom of engine case blocking pick up port
  6. Leaky piston cooling jet valves and or leaky cooling jet gaskets
  7. Oil type: If running synthetic try running conventional, we highly recommend the use of conventional oil in the M-Eight engine
  8. Oil pump sub seal O-ring damaged and or incorrect installation, install oil pump/camplate per our instructions
  9. Loctite was used on oil pump and camplate bolts, interfering with oil pump side clearances and camplate sealing to case
  10. Oil pump housing, cover or camplate face scored from debris running through it and or dry start up etc., excessive crank end play/runout
  11. Breather valves in rocker boxes not working correctly and or issue with O-ring seal inside head. Note the valves do not sit squarely on cylinder head thus cocking the valve and compromising the seal. The O-ring groove on the valve is too large for the O-ring, we recommend running an additional smaller O-ring on the top of the OE O-ring which can help hold the OE O-ring in position and assist in sealing. Use HD drain plug O-ring #11105 or a -012 to -013 O-ring.

PRESSURE ISSUE

  1. Low oil level
  2. Pressure relief valve in oil pump not seating and sealing
  3. Scoring in oil pump housing and or camplate face surface, possible dry start up, debris in oil and or excessive crankshaft end play and or crankshaft runout
  4. Leaky piston cooling jet valves and or leaky cooling jet gaskets
  5. Loose camplate pinionshaft bore ID to crank pinionshaft OD clearance, we recommend 0.0005" – 0.003"
  6. Loose lifter to lifter bore clearance, we recommend 0.001" -0.0015" lifter to lifter bore clearance – See Feuling tool #9004
  7. Loose rockershaft to bushing clearance and or excessive side end play
  8. Out of spec pressure side of oil pump due to scoring
  9. Loctite was used on oil pump and camplate bolts interfering with oil pump side clearance stack up and or camplate sealing to case
  10. Broken oil pump gears, inspect for debris in oil, excessive end play and or crankshaft runout
  11. Stripped or loose camplate/oil pump bolts causing camplate or oil pump to leak

EXCESSIVE NOISE

  1. Low oil pressure
  2. Thrusting wear from rocker arms on rocker arm stand offs in cylinder heads
  3. Quick install pushrods flexing and creating valvetrain harmonics, possible pushrods contacting tubes
  4. Under performing lifters: Scored lifter internals, valvetrain harmonics, loose lifter to lifter bore clearance, we recommend 0.001" -0.0015" lifter to lifter bore clearance – See Feuling tool #9004
  5. Excessive crankshaft runout and or excessive crankshaft end play
  6. Valvetrain harmonics, bad valvespring to camshaft combination
  7. Flexing crankshaft
  8. Compensating assembly worn, compensating bolt not installed all the way