Bad Bad news from my 306

88scgt · 01-28-2008, 07:27 PM

Well i probaly should have posted this earlier but i didnt. last weekend went home and pulled my engine out of our 86, took the oil pan off to change oil pump(kinda low oil pressure 14 lbs at idle) and sure enough bearing pieces on the pickup. granted there are about 10k of hard miles with numerous trips down the track. broke the engine down to bare block and # 8,7,4,3 and back ttwo mains were badly damaged. the rings, pistons and the cylinder walls looked great. dad took it to glenn sheppard to get the cylinder walls lokked at and check the crank. i dunno the statis yet though. if everything goes the way it should i will go home friday and get it all back together

QWKSNKE · 01-29-2008, 06:12 PM

that sucks. did the bearings show signs of detonation?

militarymustang88gt · 01-29-2008, 07:03 PM

showed signs of no oil on the bearings. and the metal in the pan wasnt looking good neither.

EHardy1971 · 01-29-2008, 07:23 PM

Sounds like a broken,or rounded oil pump driveshaft to me! Have you pulled the pump off yet?

88scgt · 01-29-2008, 11:56 PM

the pump driveshaft is not bent it is a arp driveshaft. i am pretty sure the oil pumpwent bad probally why low oil pressure. well got the news from machine shop and the crank just needs to be polished. the cylinders looked reaaly good but a few of the cylinders had lost the hone. so he is going to hone the cylinders then i will do a total reduild. i think the main reason the pump went out was from running the dog piss out of it for 10k.

BAD INT · 01-30-2008, 01:11 AM

do not go highvolume on the pump standard melling should be fine.is there some rough spots on the cylinder wall or is the cross hatch not visable?

EHardy1971 · 01-30-2008, 05:58 AM

Probably broke/collapsed the spring for the pressure valve inside the pump.And like Bad Int said,get a standard volume pump,all a high volume one is going to do is rob horsepower! My recommendation would be a standard volume high pressure one!

Wickd GT · 01-30-2008, 10:06 AM

Quote:

Originally Posted by EHardy1971

Probably broke/collapsed the spring for the pressure valve inside the pump.And like Bad Int said,get a standard volume pump,all a high volume one is going to do is rob horsepower! My recommendation would be a standard volume high pressure one!

If you have a stock pan I recomend the standard oil pump. If you have a deep pan, a high volume, I use the FMS high volume pump on mine and the FMS harden steel pump shaft. About the high volume pump robbing hp, that is BS, I have had both of them and did not see any diference going down the track, only I saw was, the standard pump with the deep pan at idle will read low oil pressure, so put back the high volume pump and good oil presure at idle, but this time it is going to be different, I put main bearings King HP 3/4 groove, so it will probably read low oil pressure at idle.

Edgar

EHardy1971 · 01-30-2008, 11:06 AM

Quote:

About the high volume pump robbing hp, that is BS,

How is that Edgar?,the HV pump is pushing more oil,which creates more parasitic drag on the engine.A HV pump is'nt really needed on a street engine without an oil cooler,etc for the extra oil to go to.Also from what I've read,they tend to pump oil to the top of the heads,and lifter valley faster than it can drain back down to the crankcase,resulting in oil starvation.

Italian LX · 01-30-2008, 11:17 AM

Quote:

Originally Posted by EHardy1971

Also from what I've read,they tend to pump oil to the top of the heads,and lifter valley faster than it can drain back down to the crankcase,resulting in oil starvation.

That highly unlikely.

01-28-2008, 07:27 PM	#1
88scgt Member Join Date: Jan 2008 Location: Auburn Posts: 46	Bad Bad news from my 306 Well i probaly should have posted this earlier but i didnt. last weekend went home and pulled my engine out of our 86, took the oil pan off to change oil pump(kinda low oil pressure 14 lbs at idle) and sure enough bearing pieces on the pickup. granted there are about 10k of hard miles with numerous trips down the track. broke the engine down to bare block and # 8,7,4,3 and back ttwo mains were badly damaged. the rings, pistons and the cylinder walls looked great. dad took it to glenn sheppard to get the cylinder walls lokked at and check the crank. i dunno the statis yet though. if everything goes the way it should i will go home friday and get it all back together

01-29-2008, 06:12 PM	#2
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	that sucks. did the bearings show signs of detonation? __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

01-29-2008, 07:03 PM	#3
militarymustang88gt Senior Member Join Date: Jun 2007 Location: bham and auburn Posts: 337	showed signs of no oil on the bearings. and the metal in the pan wasnt looking good neither. __________________ finally got my avatar. it is the white one.

01-29-2008, 07:23 PM	#4
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	Sounds like a broken,or rounded oil pump driveshaft to me! Have you pulled the pump off yet? __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS

01-30-2008, 05:58 AM	#7
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	Probably broke/collapsed the spring for the pressure valve inside the pump.And like Bad Int said,get a standard volume pump,all a high volume one is going to do is rob horsepower! My recommendation would be a standard volume high pressure one! __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS

01-29-2008, 11:56 PM	#5
88scgt Member Join Date: Jan 2008 Location: Auburn Posts: 46	the pump driveshaft is not bent it is a arp driveshaft. i am pretty sure the oil pumpwent bad probally why low oil pressure. well got the news from machine shop and the crank just needs to be polished. the cylinders looked reaaly good but a few of the cylinders had lost the hone. so he is going to hone the cylinders then i will do a total reduild. i think the main reason the pump went out was from running the dog piss out of it for 10k.

01-30-2008, 01:11 AM	#6
BAD INT Senior Member Join Date: Oct 2007 Posts: 184	do not go highvolume on the pump standard melling should be fine.is there some rough spots on the cylinder wall or is the cross hatch not visable?