Oil pump keeps failing

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Jul 13, 2017 | 06:11 PM

Rroyall415

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Oil pump keeps failing

Installed a new timing gear and oil pump and both of them keep breaking what could be wrong

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Oil pump keeps failing-20170713_185833.jpg

Oil pump keeps failing-20170713_185831.jpg

Jul 13, 2017 | 07:04 PM

G Atsma

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From: Central Cal.

Are you centering the pump on the drive cog before tightening it up?

Jul 13, 2017 | 08:00 PM

Rroyall415

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With the feeler gauges right

Jul 13, 2017 | 08:10 PM

LLLosingit

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what chain and pump are you using?

Jul 13, 2017 | 08:41 PM

Rroyall415

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Cloyes gear and stock chain and melling oil pump

Jul 13, 2017 | 10:46 PM

LLLosingit

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Quote:

Originally Posted by Rroyall415

Cloyes gear and stock chain and melling oil pump

Obviously something wrong, What engine is it?

Jul 13, 2017 | 11:04 PM

tug686spd

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Have you checked the crank snout for runout? Would take some serious pressure to break parts like that. Possibly an off center cam sprocket to. Did you roll motor over by hand after assembly to see if it spun freely? I'd first leave timing set off, pull all rockers so valves are shut, pull the spark plugs and have someone crank motor over while I watched the crank snout for runout/wobble. If you have a dial indicator great throw her on. If that looks good I'd assemble the timing set leaving front cover off, rotate motor over 2 full turns in 1/4 turn increments checking the slack in the timing chain each time. If chain ends up getting tighter in spots then your problems in the cam or cam sprocket. Was this a fresh rebuild?

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Jul 14, 2017 | 07:07 AM

Old Geezer

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Gear cracked on install. Starting the engine finished the gear failure, taking out the pump??

Jul 14, 2017 | 08:56 AM

#10

07NBSChevy

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Well you do not see that to often. Only thing I can think of is the Pump didn't have adequate clearance on the crank sprocket, or the gears inside the pump were jammed up if it failed on initial start up.

Was the crank timing sprocket pressed on all the way? If it wasn't, it could see it cracking the oil pump during torquing of the bolts.

Jul 14, 2017 | 09:46 AM

#11

Rroyall415

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5.3 lm7 engine stock engine and it spins freely it happened 30 seconds after start up gear was pressed on correctly timing chain does have some slack

Jul 14, 2017 | 07:41 PM

#12

Old Geezer

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Quote:

Originally Posted by Rroyall415

Installed a new timing gear and oil pump and both of them keep breaking what could be wrong

"keep breaking".... As in having this happen more than once?

Jul 14, 2017 | 08:25 PM

#13

nawlins-tim

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Try buying a timing chain set. All one manufacturer. And make certain nothing is dragging on the inside of the cover.

Jul 15, 2017 | 06:08 PM

#14

LS1MCSS

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From: Dover, Arkansas

If you look at the picture closely, it looks like there is wear in the area I circled. OP, does that area look worn to you? If so, it wasn't centered correctly.

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Jul 15, 2017 | 06:47 PM

#15

slogo

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Did you replace the pump because the original one broke like this? Or just because low
oil pressure? On the next one, a video of install would be entertaining.

Jul 15, 2017 | 06:50 PM

#16

G Atsma

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From: Central Cal.

Quote:

Originally Posted by Old Geezer

"keep breaking".... As in having this happen more than once?

OP, you still haven't answered this question. It is important, as you might be repeating a mistake in your build.

Jul 15, 2017 | 08:02 PM

#17

Rroyall415

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I replaced it because the o ring problem so went ahead and replaced it the first time it ran for 100 miles then the second pump only lasted 30 seconds

Jul 15, 2017 | 08:30 PM

#18

G Atsma

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From: Central Cal.

There is something very basic going wrong here. Old Geezer might have hit upon it a few posts above. The timing sprocket/oil pump drive "cog" might have been broken during/right after installation, taking the pump out with it upon startup. You might want to consult a manual before attempting the next install.