Oil pump leak (video)
#1
Oil pump leak (video)
Figured I'd post thus up just in case anyone else has the same issues. Past or future.
About two weeks ago I started to develop an oil leak. I narrowed it down to the oil pump. I figured that the oil pump seal had just went bad and needed replacing.
I got the new seal in over the weekend and she still leaked. I took her back apart and this is what I saw. Anyone else ever had this happen? Looks like I'll be putting a new front case on now.
About two weeks ago I started to develop an oil leak. I narrowed it down to the oil pump. I figured that the oil pump seal had just went bad and needed replacing.
I got the new seal in over the weekend and she still leaked. I took her back apart and this is what I saw. Anyone else ever had this happen? Looks like I'll be putting a new front case on now.
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#9
When I initially took it apart to look at it the seal was sitting halfway out of where the sprocket meets the case. I figured that it was just worn. Then I realized that the shaft itself had play.
What I imagine happened is that when there is tension on the timing belt it is letting oil pass through around the shaft and pushing the seal out.
I've got a new case on the way and will post pics of the carnage on the broken pump/shaft.
My car is sitting at 81k miles and has been sitting at over 500 hp/440 tq for the past 7 months or so.
What I imagine happened is that when there is tension on the timing belt it is letting oil pass through around the shaft and pushing the seal out.
I've got a new case on the way and will post pics of the carnage on the broken pump/shaft.
My car is sitting at 81k miles and has been sitting at over 500 hp/440 tq for the past 7 months or so.
#10
Finally got around to pulling the case off. Biggest pain in the **** was the crankshaft sprocket bolt. the service manual says 120 lb ft but there is no way lol. I sat on it for about 30 secs with a 200 ft lb impact gun and it finally loosened. Discoveries are below.
It looks likea pice of the oil pump case broke off and that is what caused the oil pump gear to become loose and leak oil. Thankfully i caught it now because this probably could have become alot worse.
Reason it broke? I have no idea. the aluminum used in that area is pretty thin. You'd think they (mitsubishi) would use something stronger in this area.
Notice all of the scoring on the shaft.
The piece where it broke off
don't mind the shavings around the area. the damned phillips head bolt in the pump cover stripped and i just drilled it out as i have a new case already. I'm guessing people use an impact driver to get that phillips head off? I don't know why they would even use a phillips head there when there are 4 other 12mm bolts.
It looks likea pice of the oil pump case broke off and that is what caused the oil pump gear to become loose and leak oil. Thankfully i caught it now because this probably could have become alot worse.
Reason it broke? I have no idea. the aluminum used in that area is pretty thin. You'd think they (mitsubishi) would use something stronger in this area.
Notice all of the scoring on the shaft.
The piece where it broke off
don't mind the shavings around the area. the damned phillips head bolt in the pump cover stripped and i just drilled it out as i have a new case already. I'm guessing people use an impact driver to get that phillips head off? I don't know why they would even use a phillips head there when there are 4 other 12mm bolts.
#11
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What kind of oil pan was used in the car? I just ask because oil pump failures are common in cars that launch hard or have a lot of lateral gs. The oil pump is supported from the oil pressure so in certain high g launches or turns you can starve the oil pump easily. This is one of the reasons behind dry sumps and the new bearing supported oil pump/front case setups.
#13
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Finally got around to pulling the case off. Biggest pain in the **** was the crankshaft sprocket bolt. the service manual says 120 lb ft but there is no way lol. I sat on it for about 30 secs with a 200 ft lb impact gun and it finally loosened. Discoveries are below.
It looks like a piece of the oil pump case broke off and that is what caused the oil pump gear to become loose and leak oil. Thankfully i caught it now because this probably could have become a lot worse.
Reason it broke? I have no idea. the aluminum used in that area is pretty thin. You'd think they (mitsubishi) would use something stronger in this area.
don't mind the shavings around the area. the damned phillips head bolt in the pump cover stripped and i just drilled it out as i have a new case already. I'm guessing people use an impact driver to get that phillips head off? I don't know why they would even use a phillips head there when there are 4 other 12mm bolts.
It looks like a piece of the oil pump case broke off and that is what caused the oil pump gear to become loose and leak oil. Thankfully i caught it now because this probably could have become a lot worse.
Reason it broke? I have no idea. the aluminum used in that area is pretty thin. You'd think they (mitsubishi) would use something stronger in this area.
don't mind the shavings around the area. the damned phillips head bolt in the pump cover stripped and i just drilled it out as i have a new case already. I'm guessing people use an impact driver to get that phillips head off? I don't know why they would even use a phillips head there when there are 4 other 12mm bolts.
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If you pull some rod bearing caps or crank caps you can see if you have any damage from contamination by looking at them. The oil cooler is notorious for having shavings stuck in it and if reused on the new engine will damage it again. I would start there to see if it has any contaminants.
Last edited by BoredDSM; Jan 30, 2014 at 09:24 PM.