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Oil Leaking, Solved One Problem to Find 3 More

  #1  
Old 2 Weeks Ago
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Oil Leaking, Solved One Problem to Find 3 More

Good Evening,

I recently had to tear down the block, replace the head gasket, head and every gasket up to the throttle body. I got it all put together, worked through the problems I caused along the way, and the only one remaining is a damned oil leak. I can't figure it out. It seems to be coming from the top of the head or someone around the timing belt. It leaks from the bottom of the timing belt cover and after driving it for a bit it starts to get onto the top cam crank and start slinging oil everywhere. I thought it was the valve cover gasket but it's replaced and siliconed into place. I didn't touch the harmonic balancer or the oil pump, I know it didn't leak oil like this before so what did I break?? Let me know your thoughts. Thanks in advance.
 
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Old 1 Week Ago
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Well there is a seal behind the cam and AUX(oil pump) gears, either could leak oil and the front main seal as well.

Doesn't matter if you "touched them" or not, each Gear would have to be moved differently from straight rotation to change the timing belt, so my guess, and it is a guess, is that one of the shaft seals has failed

Front main will leak REALLY bad, so Cam or AUX gear most likely
 
  #3  
Old 1 Week Ago
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Cam Shaft seal isn't likely, I bought a new head when I tore down the block because mine were cracked so if that seal is bad I have hell to raise with the head company. I'm buying an Auxiliary shaft seal and main seal. I took it apart and thought it was the tensioner spring bolt but thread tape and re-torquing didn't fix it. There is a bunch of oil caked up down by the main seal, and not much by the aux, I am thinking I'll do both at the same time. Is there a good DIY somewhere for these?? I assume the AUX seal is just pull the bolt off the crank and pull the seal from behind it, but how about the main seal? Pull the harmonic balancer and do the same??
 
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Old 1 Week Ago
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Front main is a pain to pull because you have to pull the timing gear and there in no room to get a puller in there
There was a tool for that, but expensive and 30 years old now
There are some interesting work arounds just google it

And try just pulling off the gear, if main has been leaking then shaft and gear will be well lubed, lol
You can sometimes pull out the woodruff key which will make pulling the gear easier, but it's specific to each engine if that will work or not.
 
  #5  
Old 1 Week Ago
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I gotta order the seals online but figured I'd break it back down anyway while it's still the weekend, I got the AUX gear off and it's coated in oil and so is everything behind it, given how much of a pain it is to pull the main seal I think I'm going to try just the Aux seal hope for some luck. Everyone keeps saying if it's the main seal it leaks A LOT vs just dripping. I'll have the main seal if I want to do it but let's hope this gets it done.
 
  #6  
Old 1 Week Ago
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Yes, "everyone is correct"
Main seals, front and rear, are right next to the end crank bearings, and they use alot of oil for cooling, so alot of oil will come out of leaking main seal, and it gets worse and worse once it starts to leak.

So yes, replace AUX shaft seal first, that should do it from your description.

I would pull the Cam gear as well, just one bolt
New used to mean "it was tested and it works"
New now means "YOU TEST IT, and we will replace it if it fails"

So "new" means squat now, can't count the number of times I have chased my tail when the "new part" was bad out of the box
 
  #7  
Old 1 Week Ago
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My AUX shaft seal was set to come in today so I hammered off the old one and while I was waiting for the UPS guy I figured I'd check the cam shaft seal like you suggested. Turns out I'm an idiot and when I bought the new head/cam I didn't move or install the cam shaft seal at all. This entire time of taking everything apart and putting it back together over and over, re-wrapping bolts, buying new seals, all I needed was an $8 cam shaft seal from Autozone on the corner. I went ahead and did the AUX seal too since I had already hammered off the old one and the new one had arrived, but 99.99999% sure the oil leak was the complete lack of a cam shaft seal. Got them back into place (helpful tip, big washers and a 2" PVC pipe work GREAT), put it all back together, filled it with water, runs like a dream and doesn't drip a drop.

I'll get it inspected and registered tomorrow.

Thanks for all your help guys!!
 
  #8  
Old 1 Week Ago
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Good work

We learn more from mistakes than successes, I have learned alot from my DIY vehicle work, so.............................yes, ALOT of mistakes, you are NOT alone

And be happy its the last cam seal you will ever forget to install

Thanks for posting the update and the fix
 
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