Pontiac Grand Prix Forums : Grandprix

I broke a cam bearing on my motor.
What causes and how can it be prevented??

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TOGs//Stge III ZZP Blower//LS1 tb// 85 maf//XP cam //105lb spings//3" Dp& high flowcat//3.2",3.0"
Ud plly//Msd wires//Aut 103's//CAI//ZZ PCM//ZZ P shift kit//42.5lb. 13.3@104MPH DEC 08

low oil pressure. water in the oil. small particles and junk in the oil that collect over time and block oiling passages.

could be a few reasons.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

im staying away from cams...

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white 04 comg G gtp. wizair, pacesetters, slp 1.8 rr
its slow.

no no no no no. cams are good. you just need to have a good running motor and keep it that way. youve also gotta install stuff correctly.

the biggest power on these cars comes from heads, cams, and intercoolers in that order.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

You know, i just took apart an engine last week that was toasted.

When I went to pull the cam, it would not come out. Finally it did...but one of the cam bearings cam with it. Finally got the entire cam out of the block, and the bearing fell off inside, and once I retrieved it, it looked a lot like yours.

A few rod bearings looked the same too. In this motors case, the reason for failure was either NOT changing their oil like they should or using very crappy oil if they did (massive build up and deposits through out the block) or they ran the oil low. My main guess would be a leaky LIM or Head gasket wiped this motor out if I had to put money on it because of what the cylinders looked like. So in this case...water/coolant in the oil did the damage for mine.

~F~

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so many people just seem to spin bearings.

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white 04 comg G gtp. wizair, pacesetters, slp 1.8 rr
its slow.

i use whatever oil is the cheapest at advance at the time. usually it is their brand oil. so far im having absolutely no problem with oil pressure.

oil is oil unless youre a freak and run synthetic in a $3000 car.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

I did have an oil pressure problem.
http://www.grandprixforums.net/f18/o...elp-10289.html (Oil pressure light came on help....)
The mechanic seems to think the problem for the low oil pressure was because of the broken bearing.
So did i spun a bearing because of low oil pressure then?
Because i bought this 02 motor from a junk yard two months ago and was using castrol full syntetic oil.

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TOGs//Stge III ZZP Blower//LS1 tb// 85 maf//XP cam //105lb spings//3" Dp& high flowcat//3.2",3.0"
Ud plly//Msd wires//Aut 103's//CAI//ZZ PCM//ZZ P shift kit//42.5lb. 13.3@104MPH DEC 08

So why the low oil pressure when its rare or even imposible for the oil pump to go out on these cars?
Could it have been the bad cam bearing?
Or the particles of metal where causing the problem maybe on the oil breather?
The mech said chunks of metal were on the oil pan.

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TOGs//Stge III ZZP Blower//LS1 tb// 85 maf//XP cam //105lb spings//3" Dp& high flowcat//3.2",3.0"
Ud plly//Msd wires//Aut 103's//CAI//ZZ PCM//ZZ P shift kit//42.5lb. 13.3@104MPH DEC 08

the cam bearing caused the low oil pressure more than likely, but it probably spun because it wasnt getting lubed properly or had water in it.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

I use nothing but Mobil1 10W30, and a M1-201 Blazer oil filter in ALL of my GTP's....as well as my other cars.


you get what you pay for.

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2001 GTP street car- GT45 turbo,Stage 4 Intense turbo cam,FMIC,150 wet, double roller timing chain, Diamond forged coated pistons 8:0:1, Diamond piston rings, cryoed L32 connecting rods, Cryoed crank, Clevite77 main bearings, Clevite77 cam bearings, Clevite77 L32 rod bearings, ARP Everything, Intense/meizere true billet Flexplate, Custom UIM, Intense oil pressure kit, Cometic 4 layer head gaskets, OE-R lifters, Cryoed L67 block, ATI turbo dampner, SDD FATMAN FUEL RAILS!!!!!!!!!

i dont care about my car. maybe one day if i beat it enough it will give back all the money that is into it.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

I guess its different for some of us. Trade in on my car in my area is still $10k. She gets Royal Purple ($50 for oil and filter). I see the savings in MPG though, as well as the obvious reduced friction in the engine.

Spun bearings can come from a few things. On our engines I would think coolant in the oil as the stock LIM gaskets love to leak. If not caught early enough they can do damage. That's one of the first things I accomplished. Water can also do it; cheap oil possibly if it sludged up some and blocked an oil passage. Beyond that, over-revving is the only thing I can think of.

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2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI

NAIOA moderator Still Imp'n, just in a different Imp.

guess im a freak too! i run moble1 synth in my gtp and in my bird!

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'01 GTP mods: K&N intake, autolite 104's, drilled 180*, !u-bend, !EGR, ported s/c, polished heads and TB and a LOT more whine

'98 Formula mods: custom TD exhaust, LS6 IM, RA intake, and a few suspension parts