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Old 11-15-2013, 10:37 AM   #1
KCHPFM3
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Question Oil leak in HPF 2.5 from timing chain cover

It's a long story but after a year of finally sorting out my 2.5 by discovering I needed to replace the dual vanos...I have a small oil leak that is apparently coming from the timing chain cover.
After trying to seal it a couple times with a liquid sealent it still leaks after wot runs. I know the main reason is the bolts aren't made to be torqued more than 15lbs or so on the cover and that the cover is also not built to handle 600+ horsepower.
The leak is more annoying than a real problem and the only thing that is "off" on the car (knock on wood), and only ends up leaving a small drop on the floor after it makes it's way down the next day. But as you all know we like to have our cars running perfect.
I'm just wondering if anyone else has had this problem or can possibly offer a solution?
Thanks for any thoughts on this!
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Old 11-15-2013, 06:27 PM   #2
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Oil leak in HPF 2.5 from timing chain cover

Which part of the cover is it leaking from? If it's the top (head to t-cover), I'm dealing with that and my intial thoughts are head lift as I seem to be getting some excessive cooling system pressure after a few pulls. I'm a stock block though w/ e85 and 15psi. Planning on L19's and OE headgasket this winter with a worked over head I have on the shelf. I bought ray's (yellowssm) car last month for anyone wondering lol.


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Old 11-15-2013, 10:50 PM   #3
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Not exactly sure where leak is originating from but the top would make sense as the shop I take the car to suggested the head gasket be replaced. I question the diagnosis as there hasn't been any coolant leaking in. As you can imagine.. not super excited about replacing head gasket.
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Old 11-15-2013, 11:34 PM   #4
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Oil leak in HPF 2.5 from timing chain cover

Did you check the timing chain bolt on the right side of the timing chain cover. Its near the oil filter housing. It loosens over time which will give you a small oil leak.



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Old 11-16-2013, 10:51 AM   #5
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Thanks for the tip, I will check it and see if that's the case.
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Old 11-16-2013, 04:38 PM   #6
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Oil leak in HPF 2.5 from timing chain cover

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Thanks for the tip, I will check it and see if that's the case.
Did you find it?


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Old 11-16-2013, 09:23 PM   #7
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I didn't have a chance to get under there today. A couple of weeks ago I had it in the shop to check the leak again and I would think they would have checked that. If I don't have time tomorrow I will call the them on Monday to check.
This was a different place than the shop that did the vanos replacement. The vanos shop thinks I need to replace the head gasket while the other shop says it's the timing chain cover and probably not worth the time to try and seal it again.
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Old 11-18-2013, 10:14 AM   #8
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Re: Oil leak in HPF 2.5 from timing chain cover

The side gaskets are one use. once front cover is tighten and remove you have to replace them. same goes with head gasket that goes around top of front cover. At the bottom its connecting to pan which has a rubber seal which stays good for awhile even after removing cover or pan a few times..as long as its not damaged or just to old. You need new side gaskets. They are five bucks each. and the top needs to be seals with black rtv. to put it on so it seals the pan needs to be lowered by loosening all the pan bolts and side power steering bolt. Also remove front main seal to install cover otherwise it'll make it harder to put on to make sure top os sealed right. Install seal afterwards with plastic sleeve on crank. Seal press also best but I've done it with two inch punch and hammer before haha. Anyways there is really not a lot of pressure there so wot won't effect it to much, check Vanos sealing plate, did you use beisan o rings?

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Old 11-18-2013, 03:17 PM   #9
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Oil leak in HPF 2.5 from timing chain cover

Quote:
Originally Posted by InDiGlOM3 View Post
The side gaskets are one use. once front cover is tighten and remove you have to replace them. same goes with head gasket that goes around top of front cover. At the bottom its connecting to pan which has a rubber seal which stays good for awhile even after removing cover or pan a few times..as long as its not damaged or just to old. You need new side gaskets. They are five bucks each. and the top needs to be seals with black rtv. to put it on so it seals the pan needs to be lowered by loosening all the pan bolts and side power steering bolt. Also remove front main seal to install cover otherwise it'll make it harder to put on to make sure top os sealed right. Install seal afterwards with plastic sleeve on crank. Seal press also best but I've done it with two inch punch and hammer before haha. Anyways there is really not a lot of pressure there so wot won't effect it to much, check Vanos sealing plate, did you use beisan o rings?

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Old 11-18-2013, 07:00 PM   #10
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Very good info indeed! I forwarded this info to the tuning shop that replaced the vanos to see that all of this was done. I typically am not comfortable doing this type of work on my own. Thanks!
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Old 11-19-2013, 07:48 PM   #11
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Re: Oil leak in HPF 2.5 from timing chain cover

Where are you located?

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Old 11-20-2013, 04:17 AM   #12
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Quote:
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Where are you located?

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His Location says Kansas city.. thats about an 8 hr drive to you jesse

he can ship it to you and have you go over the whole kit/engine?
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Old 11-20-2013, 09:03 AM   #13
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Yes, I'm in Kansas City. The whole kit was actually sorted during the year it was in the shop. It was running very rich so we followed the hpf trouble shooting guide ended up sending almost everything back to hpf to test under their recommendations. Turned out nothing was wrong with the kit and we needed to replace the vanos. We unlocked the AEM and re-tuned the car and it's running perfectly (585 whp w/o meth, 690whp, w/meth). The only issue is really the small oil leak. Thanks again for your thoughts guys!
And I haven't heard back from the shop yet...
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