Hole in rear of oil pan
#1
Hole in rear of oil pan
I tried to find more information on this, but I couldn't find any. I have had a small oil leak since I reassembled my engine. It is a 1.8 from a 1997 and was bored over, hot tanked, and decked.
The leak was a few drops after hard driving with a t2560 at 12psi. But now I am running an EFR6758 and the leak has become significantly worse. The oil appears to be coming from the transmission weep hole and clutch fork shift boot. I have replace my rear main seal twice now, and the second time I used an OEM Mazda seal with FM install tool. I have also replaced my oil pan gasket and the leak persists. So I am now replacing the steel(?) oil galley plug with an OEM Mazda brass plug.
I have also replace the CAS o-ring and I am certain it is no longer leaking(back of head and tops of trans is dry).
But upon looking at the oil pan, I spotted a hole in it. Is this normal?
The leak was a few drops after hard driving with a t2560 at 12psi. But now I am running an EFR6758 and the leak has become significantly worse. The oil appears to be coming from the transmission weep hole and clutch fork shift boot. I have replace my rear main seal twice now, and the second time I used an OEM Mazda seal with FM install tool. I have also replaced my oil pan gasket and the leak persists. So I am now replacing the steel(?) oil galley plug with an OEM Mazda brass plug.
I have also replace the CAS o-ring and I am certain it is no longer leaking(back of head and tops of trans is dry).
But upon looking at the oil pan, I spotted a hole in it. Is this normal?
#5
I replaced the galley plug the machine shop used. This is a comparison of he plug and the OEM Mazda part. The plug came out very easily.
The brass plug has a tapered end and the block has a machine surface for it to mate to. I added a little anaerobic sealant and made sure it counter sunk a little.
The brass plug has a tapered end and the block has a machine surface for it to mate to. I added a little anaerobic sealant and made sure it counter sunk a little.
#6
Sorry to revive my old thread, but I am at loss for how to proceed. I still have oil leaking out of the transmission weep hole and out the clutch fork shift boot. I have replaced the CAS O-ring and have made sure the back of head and top of the transmission are completely dry.
I have replaced the rear main seal twice, the second time with an OEM Mazda part and all installations have been done with the FM installation tool. I have re-sealed my oil pan, rear main seal holder, and just last weekend, I replace the steel plug in the oil galley with an OEM brass plug. The car continues to leak oil as if I haven't replaced anything.
Is there something I missed? Can I start the engine without the transmission to spot the leak(I can cut a bracket out up my old broken 5 speeds trans to make a starter holder)? Or is there a way to pressurize the oil system to find the leak? I have tried dye in the oil, and since the leak hits the flywheel, it sprays oil everywhere in the bellhousing.
I have replaced the rear main seal twice, the second time with an OEM Mazda part and all installations have been done with the FM installation tool. I have re-sealed my oil pan, rear main seal holder, and just last weekend, I replace the steel plug in the oil galley with an OEM brass plug. The car continues to leak oil as if I haven't replaced anything.
Is there something I missed? Can I start the engine without the transmission to spot the leak(I can cut a bracket out up my old broken 5 speeds trans to make a starter holder)? Or is there a way to pressurize the oil system to find the leak? I have tried dye in the oil, and since the leak hits the flywheel, it sprays oil everywhere in the bellhousing.
#9
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Are you certain it is engine oil and not gear oil, did you change the front seals on the tranny?
I always use locktite blue on my flywheel bolts, but even the new bolt in, "which is the right bolt" or something like that, has sealant or locking compound on the threads from Mazda. You can see in there with the bolts removed.
I always use locktite blue on my flywheel bolts, but even the new bolt in, "which is the right bolt" or something like that, has sealant or locking compound on the threads from Mazda. You can see in there with the bolts removed.
#12
Thanks for the tip, I will use the proper sealant. The trans will drop this weekend and in will go another oem rear main seal. Provided the crank seal surface is in good condition.
"Are you certain it is engine oil and not gear oil, did you change the front seals on the tranny?"
Sorry I missed this before, I have replaced both seals on the transmission. The fluid the is leaking does not smell like gear oil.
I will continue to update this thread, unless it becomes annoying to anyone. Thank you for all your suggestions.
"Are you certain it is engine oil and not gear oil, did you change the front seals on the tranny?"
Sorry I missed this before, I have replaced both seals on the transmission. The fluid the is leaking does not smell like gear oil.
I will continue to update this thread, unless it becomes annoying to anyone. Thank you for all your suggestions.
#16
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Those look pretty deep. You could try knocking the high spots down with some emory cloth and hoping for the best. However if my experience with a scratched up cam seal has taught me, it doesn't take of a scratch on the sealing surface to cause a good sized leak. I would say next time use a soft faced hammer or rear main tool to install the seal. It looks like a screw driver (or punch) with a steel head hammer was used to drive the seal in based on the gouges and impact impressions on the edge.
#18
I have modified my valve cover to allow for more crank pressure. I have also removed the pcv valve and both valve cover ports are going to a catch can.
I think the previous owner did used a screw driver to remove the old seal. I once asked him how much was a engine gasket kit for a rebuild, and he said he didn't use gaskets, just a bunch of rtv.
I noticed when I was removed the FM tool with an electric impact gun the bottom the rear main seal holder moved. I don't think the seal was at the proper depth on the bottom. I used a wooden dowel and hammer to tap it into place. I then used the FM tool to verify I reached proper depth. Hopefully this was the issue, I will start the car soon.
I think the previous owner did used a screw driver to remove the old seal. I once asked him how much was a engine gasket kit for a rebuild, and he said he didn't use gaskets, just a bunch of rtv.
I noticed when I was removed the FM tool with an electric impact gun the bottom the rear main seal holder moved. I don't think the seal was at the proper depth on the bottom. I used a wooden dowel and hammer to tap it into place. I then used the FM tool to verify I reached proper depth. Hopefully this was the issue, I will start the car soon.
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