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Old 10-24-2013, 10:21 AM   #1
gr8daneh
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GM Oil pump fail

Hi guys, finally got bit. Started it up and rolled about 50 feet and got the dreaded "No Oil Pressure" message. Shut it down. I know you've heard this story before. Here is the twist...

This was already a new pump installed when I did my CAM at 10,000 miles. I am now just over 25,000. JDP motorsports suggested the early change as a preventive measure at that time. Little did they know that the GM pumps continue to fail even in the new year models and was not just a bad batch problem. They have fixed 6 other Camaro's already this year apparently.

So the moral to my story and maybe what you readers should take away is don't replace bad with bad. I am going to put a Melling oil pump in this time which is what JDP is using going forward. I am just hoping that there was no damage up top to add to my grief.

That is all! Have a good day.

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Old 10-24-2013, 10:41 AM   #2
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Thanks for letting us know. Hopefully no damage!!
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Old 10-24-2013, 01:28 PM   #3
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Sorry to hear but wow lack of details.How did it fail?Debris cause a the reliefe plunger to be stuck i assume? No aftermarket pump will fix that unfortunetly as they all are copies of the OE design in that regard.Bad batch? What was bad about them?
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Old 10-24-2013, 01:31 PM   #4
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Is it a more aggressive cam which is causing these to break, or is this happening on stock engines as well?
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Old 10-24-2013, 03:39 PM   #5
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Originally Posted by briancb1 View Post
Sorry to hear but wow lack of details.How did it fail?Debris cause a the reliefe plunger to be stuck i assume? No aftermarket pump will fix that unfortunetly as they all are copies of the OE design in that regard.Bad batch? What was bad about them?
No it is not a copy melling 10296's are of different materials and are blue printed. The plunger sticks or the rotors gall due to two cheap metals in contact with each other.

Ls pumps have sucked since 1997 they are all the same. Except the L99's but the melling a are still an upgrade.
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Old 10-24-2013, 03:41 PM   #6
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Is it a more aggressive cam which is causing these to break, or is this happening on stock engines as well?
Pump failures have absolutely NO correlation with big cams.
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Old 10-24-2013, 03:48 PM   #7
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Sorry to hear but wow lack of details.How did it fail?Debris cause a the reliefe plunger to be stuck i assume? No aftermarket pump will fix that unfortunetly as they all are copies of the OE design in that regard.Bad batch? What was bad about them?
Unknown what the failure mechanism is. The event was just last night. JDP is going to open it up this weekend, but all indicators are debris causing a stuck plunger which is the common failure mode with the GM pumps.

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Old 10-29-2013, 10:44 AM   #8
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Fuuuuuu****K! Just got the verdict. Scored my CAM to sh*t, lifters are bad, check valve completely stuck open on pump = no pressure. Only ran for less than a minute this way. Looks like major dollars for less than 15,000 miles of run time. Can't believe it. :((
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Old 10-29-2013, 10:54 AM   #9
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Originally Posted by gr8daneh View Post
Fuuuuuu****K! Just got the verdict. Scored my CAM to sh*t, lifters are bad, check valve completely stuck open on pump = no pressure. Only ran for less than a minute this way. Looks like major dollars for less than 15,000 miles of run time. Can't believe it. :((
What a nightmare, sorry man, thats awful.
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Old 10-29-2013, 11:21 AM   #10
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Originally Posted by gr8daneh View Post
Fuuuuuu****K! Just got the verdict. Scored my CAM to sh*t, lifters are bad, check valve completely stuck open on pump = no pressure. Only ran for less than a minute this way. Looks like major dollars for less than 15,000 miles of run time. Can't believe it. :((
Question then is: did the cam disintegrate first, introducing metal into the oil and causing the oil pump regulator to stick? Seems to be common, and frankly makes me very nervous, given my setup.

Cam brand? Oil brand?

Sorry for your troubles, OP. Good luck, my friend.
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Old 10-29-2013, 12:25 PM   #11
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What a nightmare, sorry man, thats awful.
Thanks! Appreciate the empathy...

Quote:
Question then is: did the cam disintegrate first, introducing metal into the oil and causing the oil pump regulator to stick? Seems to be common, and frankly makes me very nervous, given my setup.

Cam brand? Oil brand?

Sorry for your troubles, OP. Good luck, my friend.
CAM Is missing a chunk, not sure that happened first. Comp CAM, Mobil synthetic. Thanks for the wishes.
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Old 10-29-2013, 06:03 PM   #12
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Mobil 1 makes me cringe when guys/gals get aggressive cams
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Old 10-29-2013, 06:10 PM   #13
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Mobil 1 makes me cringe when guys/gals get aggressive cams
May I ask why? I'm actually curious due to the fact I'm going in for a Cam install Monday and that's what they said they are going to put in the car.
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Old 10-29-2013, 07:52 PM   #14
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Sounds like another one of the comp cam failures. A chunk of a cam for less then 60 seconds without oil pressure seems like a bit much.

I once had a Dodge Ram with a 318 where the old gasket stuck to the block after changing the oil and filter. With more then 1 minute running driving to an exit with no oil pressure I had the truck towed home, put a new filter and oil, and all's well for 140,000 miles and counting (my brother in-law still has it on the road).

I've got a the factory oil pump in my car with over 30,000 miles since a cam swap (ZR1 cam) with nothing but Mobil 1 0W40. The rev limiter is set at 6,800 rpm and is brought that high pretty frequently with dozens of 1/8 mile passes. Only at my last oil change did I start adding a ZDP additive.

Granted my cam uses stock springs which aren't high pressure but I wonder how many of the oil pump failures posted have been with comp cams?
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Old 10-30-2013, 09:09 AM   #15
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Engine failed first...Oil pump failed second...I've read every one of these threads in the past 4 years
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Old 10-30-2013, 09:22 AM   #16
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Thanks! Appreciate the empathy...



CAM Is missing a chunk, not sure that happened first. Comp CAM, Mobil synthetic. Thanks for the wishes.
Underlined in red is a big part of your problem and could be the source. M1 has no business being in a cammed engine. The aftermarket cams just have too fast of a ramp rate and M1 in ANY weight either does not have the film strength or correct amount of ZDDP. There have been too many lifter/cam failures in the last couple of years and almost all of them (including me) had M1 in the crank case. Anyone who reads this should be warned. Don't use M1 of any type or weight no matter what your tuner/builder recommends if you have a aftermarket cam. The oil just is not what it used to be.
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Old 10-30-2013, 09:34 AM   #17
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Sorry to hear of your troubles gr8. There really isn't much going on inside of these pumps for them to be having all these problems. Couple of gears, a spring, check ball is about it. Must be bad materials.

What kind of oil do you guys running cams recommend? I have the G6X3 cam, which is pretty radical, and I would rather be safe than sorry. Does Royal Purple have the additives in it to reduce wear on the cam lobes? I thought about trying Joe Gibbs oil because it has the zink additive in it.
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