Oil Pump GeRotor

discostew

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Sep 14, 2010
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Pretty sure those are all Bosch engine covers. I would say it's more like you can probably find a good used front cover. But I really find it hard to believe that most used front covers are ok.
 

Flyfish

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Oct 29, 2004
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This looks like the right one. Rimmer Brothers links to this as a replacement and says they will have stock soon.

yea, I had wrong part number. If his is a 96, ERR6815 should be correct. New old stock.

 

discostew

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Sep 14, 2010
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I’m not sure if the one I posted is right. It doesn’t look like it’s got a hole for the cam sensor. But I bet you could find the right one from Rimmer Brothers
 
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terryjm1

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Jan 23, 2011
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Seems that locked up slipped liner 4.0 I had was well worth the time to tear down for the front cover if nothing else. I also have a D1 I picked up last year that was reported to have just been rebuilt with 4.6 internals. It looks the part and runs fantastic but the oil light flickers after long drives at idle. If a new sensor doesn’t fix it I will have an immediate use for that front cover.
 

Flyfish

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Oct 29, 2004
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the oil light flickers after long drives at idle
What weight oil are you running? Maybe he didn’t replace the pump when he built that engine.

I get that Roy had a front cover issue from the balancer blowing up. But otherwise, I didn’t think front covers going bad was a common thing. I’ve seen plenty of pumps replaced, but not a single cover that I can recall.
 
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terryjm1

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Jan 23, 2011
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What weight oil are you running? Maybe he didn’t replace the pump when he bui that engine.

I get that Roy had a front cover issue from the balancer blowing up. But otherwise, I didn’t think front covers going bad was a common thing. I’ve seen plenty of pumps replaced, but not a single cover that I can recall.

Good thoughts, thanks. I will put some fresh oil (15w40) in it when I change the sensor and give it some time before I tear into the oil pump. The project got set aside behind some others but it’s not far down the list.
 

Flyfish

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I will put some fresh oil (15w40) in it when I change the sensor and give it some time
I think that’s the best plan. Maybe look at the oil pick-up screen when the you have the.opportunity.

There are some fearless people here with regards to the oil light. Theoretically the light is triggered at 7-8psi which seems like that could make things dry out pretty quickly even at 700-800 RPM’s.. But that’s just my opinion, haven’t tried it!

I wouldn’t be able to shut the engine off fast enough if my light came on.
 
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Flyfish

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I think the oil pump and front cover didn't get damaged by the actual failure of the balancer. I think he might have pushed the woodruf key into the oil pump when he installed the new one.
The balancer/pulley typically doesn’t take force to fit so he probably would have noticed if it was binding on the key but I wasn’t there, so couldn’t say.

I was just making the point that there was some outside factory that messed up the front cover because, aside from the pump, front covers rarely have any issues.
 

discostew

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I don't know what happened. I think I used to see that on the old buick engines that you had to pull the balancer and pull it back on with an installer and at the same time making sure the key stays in place. It's pretty hard to mess that up when you can just slide the balancer on over the key.
 

reelsretreat

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Jul 10, 2021
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I've got a 98 with a 4.0 gems. Had low oil pressure at hot idle. Front cover was scored. Rebuilt engine but still had same problem. My mechanic and I searched the world over (online) and no new front covers and any used ones were just as bad. Got advice to sleeve oil ports under rockers with 3/16" brake line cut in 1/8th" lengths and did that. Still had problem using anything but Liqui Moly 10w 60, I haven't had any problems since I started using it. I'm in Texas where it's real hot in the summer. Also went to a 180 thermostat.
 

discostew

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I worked at an auto parts store as a teen. We delivered an oddly large amount of gear oil to one particular “easy credit” used car lot.
I had a small block built for me by a local guy with a machine shop in his garage. That thing had so much oil pressure I worried about blowing the oil filter off it on a cold start
 

terryjm1

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Jan 23, 2011
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I had a small block built for me by a local guy with a machine shop in his garage. That thing had so much oil pressure I worried about blowing the oil filter off it on a cold start
Very first engine I assembled myself was an Oldsmobile 215 V8 (very similar to a rover / Buick V8 but with extra head bolts) that I put into a TR7. I used one of the uprated oil pump gear kits (longer gears and a spacer plate with a higher tension spring assortment) and it gave crazy higher oil pressure. Being a 17 year old I didn’t know any better and used the highest tension spring (more is better, lol). Within a couple hundred miles I had metallic sparkling oil. The distributor drive gear was grinding down along with the cam gear. Changed to a lighter spring and replaced the distributor drive gear and it ran fine.