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Old 06-03-2005, 02:16 AM   #1
speedblind
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Default Replacing Oil Pump on 1.8L - Advice Needed

Need some help - trying to track down a Chilton manual for this, but not having much luck. Have a 93 Impreza wagon with the monster 1.8L. Starts and makes a hellish sound, as if not getting any lubrication. All fluid levels are perfect and have been for months. It has a small intermittent oil leak that I'm told is normal for old Subies.

I figure the culprit is the oil pump, so my question is, how hard it it to change it? I'm assuming it's an internal unit, so do I have to tear the entire engine down to get to it? Depending on the level of pain involved, I may just 1. Part it out and sell it for scrap or 2. Buy a 2.5L RS engine and swap it in (not sure of tranny fitment, etc. though).
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Old 06-03-2005, 02:32 AM   #2
Max Umbarger
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No you don't need to tear the whole motor down. It would be a good time to change timing belt, and water pump if they need to be. Also new seals for up front, and then the thing prolly wouldn't leak again for a while.

it's best to get the whole oil pump assy with both inner and outer rotors.

I have the Chilton, it says to drain oil & coolant.

Take off water pump

remove oil pump mounting bolts.

remove front crank seal

Then Install:

install rotors (if not already)

install new oil seal

Assemble oil pump

Install Water pump

fill fluids(bleed coolant)

Prolly 2-3 hours of steady at home work.

MAX
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Old 06-03-2005, 01:05 PM   #3
speedblind
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Awesome reply - thanks!!
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Old 06-03-2005, 08:07 PM   #4
ImprezaVA
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Default oil leak

Take out the phillip screws in the back of the oil pump, apply loc-tite, and re-tighten. I like a screwdriver with a fat handle so you can get extra torque on those screws. After doing this and replacing the oil pump o-ring and crank seal, you more than likely won't need baby diapers anymore.

Good luck.

-Charles-
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Old 06-03-2005, 08:09 PM   #5
ImprezaVA
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You know, I just re-read your post. Just what kind of sound is it making? I'd think the noise would more than likely be a faulty timing belt tensioner.

-Charles-
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Old 06-04-2005, 02:08 AM   #6
Pakin
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I surprised no one mentioned a sealant being applied to the mating surface of the oil pump.

I use T3 and leave space for where the oil pump o-ring goes (do not cover up).

If it is a very "hellish" sound, it should be oil pump cavitation. Faulty tensioners are usually less pronounced.

-paK +4
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Old 06-04-2005, 10:39 AM   #7
ImprezaVA
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Quote:
I'm surprised no one mentioned a sealant being applied to the mating surface of the oil pump.
Yes, that too. I should have remembered that b/c it was kind of a PITA to get it on w/o smearing sealant. I used regular black RTV and it's been leak free for a year now. I also used a dab of RTV on the o-ring to hold it in place.

Here's some helpful links:
http://endwrench.com/images/pdfs/OilPumps.pdf
http://endwrench.com/images/pdfs/2.2Liter.pdf (2.2L but similar)
http://endwrench.com/images/pdfs/TBeltEWWin05.pdf
http://endwrench.com/images/pdfs/2.2SingleOverWin01.pdf (2.2L but similar)

Here is what you're up against:


-Charles-
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Old 06-06-2005, 01:04 AM   #8
speedblind
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Quote:
Originally Posted by ImprezaVA
You know, I just re-read your post. Just what kind of sound is it making? I'd think the noise would more than likely be a faulty timing belt tensioner.

-Charles-

The sound was a very loud, very noticeable screeching. Sounded like the engine wasn't getting any lubrication. Only heard it before a couple seconds before shutting it down. Oil pump was just my best guess - open to other options.
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Old 06-06-2005, 08:03 PM   #9
ImprezaVA
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As per my first link just above, endwrench states that the only time the oil pump should be replaced is when its cracked or damaged.

Are you sure it's not a belt. I thought my girlfriend's car needed the valves adjusted the other day. Turned out to be a screechy belt. To be honest, its the first time I've used that Prestone Belt Dressing and it worked.

Just to be sure, it'd be nice to know what oil pressure you are running. I've always heard that when your oil light comes on its too late anyway. Like 2-3 psi or something. I hope you find/fix your problem.

-Charles-
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Old 06-06-2005, 10:44 PM   #10
speedblind
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Default

I'd like to see oil pressure too, but don't have a gauge. It'd definitely not a belit - I checked them and they're fine. The sound I'm hearing is purely mechanical, like metal on metal. The only thing I can think is that the engine isn't getting lubrication.

Thanks for posting those links. They were very helpful.
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Old 06-06-2005, 11:08 PM   #11
Tim Sanderson
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I agree with imprezaVA, I'm not sure it is the oil pump. It may be, but it sounds more like an adler pulley or water pump. Have you checked the power steering fluid level? They get pretty grumpy when they are low on fluid. Any leaks?

On your way into changing the oil pump, be sure to inspect all the pulleys in there. I think there are 5. 2 idlers on the left side, one for the tensioner,one with teeth just under the water pump, and the water pump.

Good luck and good thinking shutting her down right away. Funny how sometimes people think it will just go away.
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