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Leak at Timing Chain Cover #4113988 06/03/16 07:43 AM
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SavagePatch Offline OP
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Is it possible that using a High Mileage oil would stop a small leak (3 drips a week on garage floor) at the timing chain cover on a 2010 Chevy Traverse?

The plan is to eventually have the seal/gasket replaced but in the mean time I was thinking about trying this.

Also, this leak developed right after having the power steering pump replaced under warranty. Any possibility that it's related somehow? Or just a coincidence...

Thanks in advance!

Re: Leak at Timing Chain Cover [Re: SavagePatch] #4113993 06/03/16 07:48 AM
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bigt61 Offline
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Yeah, MaxLife Blend should fix it. Coincidence.


92 Suburban 2500 7.4L 58k M1_0w40 5yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 5yr OCI
13 Dodge Dart 2.0L 30k PP 0w20 OLM OCI
70 Camaro 5.7L 59k
Re: Leak at Timing Chain Cover [Re: SavagePatch] #4114020 06/03/16 08:22 AM
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Ducked Offline
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Three?

drips?

a week?

I hope that's a scheduled oil change.

Re: Leak at Timing Chain Cover [Re: SavagePatch] #4114023 06/03/16 08:27 AM
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Trav Offline
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Its just a coincidence the leak occurred after PS pump replacement.
The timing cover on the 3.6 does not use a conventional gasket but uses an RTV sealant. Do not use any sort of stop leak or HM oil, the esters used to swell seals is aggressive to RTV.

When there is no break in the RTV to cause a leak the additional seal swellers in HM oil is not so aggressive that it deteriorates the RTV but once the seal is broken more of the sealing surface is exposed and can actually be made worse with it. RTV doesn't swell like a rubber or polymer seal it just deteriorates.
The best ting to do IMO is live with it until its repaired, at that time it may be prudent to have the chain, tensioners and slippers replaced as preventive maintenance as it is all exposed anyway.


ASE L1, Master. Deutsch Meisterbrief.
Re: Leak at Timing Chain Cover [Re: Trav] #4114064 06/03/16 09:06 AM
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GSCJR Offline
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Very informative; thank you for posting this Trav.


07 3.5L VQ35DE NAPA FS 5w-20 ProSelect 21358 156KM
10 3.5L 2GR-FE NAPA FS 5w-20 ProSelect 27047 176KM
Re: Leak at Timing Chain Cover [Re: SavagePatch] #4114071 06/03/16 09:11 AM
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mjoekingz28 Offline
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I have an idea for you OP.

Take your high mileage oil and a red oil rag and begin rubbing down the affected area a time or two here and there.

Re: Leak at Timing Chain Cover [Re: Trav] #4114075 06/03/16 09:16 AM
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SavagePatch Offline OP
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Originally Posted By: Trav
Its just a coincidence the leak occurred after PS pump replacement.
The timing cover on the 3.6 does not use a conventional gasket but uses an RTV sealant. Do not use any sort of stop leak or HM oil, the esters used to swell seals is aggressive to RTV.

When there is no break in the RTV to cause a leak the additional seal swellers in HM oil is not so aggressive that it deteriorates the RTV but once the seal is broken more of the sealing surface is exposed and can actually be made worse with it. RTV doesn't swell like a rubber or polymer seal it just deteriorates.
The best ting to do IMO is live with it until its repaired, at that time it may be prudent to have the chain, tensioners and slippers replaced as preventive maintenance as it is all exposed anyway.


Thanks! Most informative reply I've read in a long time. Much appreciated.

Re: Leak at Timing Chain Cover [Re: SavagePatch] #4114088 06/03/16 09:26 AM
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Leo99 Offline
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For 3 drops a week, I'd put a cheap cookie sheet and put it under the car and be done.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 392,000 miles
2015 Camry 90,000 miles
Re: Leak at Timing Chain Cover [Re: Leo99] #4114108 06/03/16 09:41 AM
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SavagePatch Offline OP
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Originally Posted By: Leo99
For 3 drops a week, I'd put a cheap cookie sheet and put it under the car and be done.
Good advice. Looking towards the future though as leaks tend to get worse with time.

Re: Leak at Timing Chain Cover [Re: Trav] #4114135 06/03/16 10:02 AM
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Bgallagher Offline
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Originally Posted By: Trav
Its just a coincidence the leak occurred after PS pump replacement.
The timing cover on the 3.6 does not use a conventional gasket but uses an RTV sealant. Do not use any sort of stop leak or HM oil, the esters used to swell seals is aggressive to RTV.

When there is no break in the RTV to cause a leak the additional seal swellers in HM oil is not so aggressive that it deteriorates the RTV but once the seal is broken more of the sealing surface is exposed and can actually be made worse with it. RTV doesn't swell like a rubber or polymer seal it just deteriorates.
The best ting to do IMO is live with it until its repaired, at that time it may be prudent to have the chain, tensioners and slippers replaced as preventive maintenance as it is all exposed anyway.


+1 If you are going to fix the cover you might as well do the whole job. I would also hold off and do the whole thing


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
Re: Leak at Timing Chain Cover [Re: SavagePatch] #4114158 06/03/16 10:20 AM
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440Magnum Offline
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Originally Posted By: SavagePatch

Also, this leak developed right after having the power steering pump replaced under warranty. Any possibility that it's related somehow? Or just a coincidence...

Thanks in advance!


Do any of the bolts that have to be removed to R&R the power steering pump pass through the timing cover? If so, then the seal could have been disturbed during that service. If not- then just coincidence or else some PS fluid got slopped around and that's what you're seeing dripping off the engine now. You might clean the area thoroughly to rule that possibility out.


'66 Dodge Polara & '69 Dodge Coronet R/T both 440/727
'08 Ram 1500 4.7/545RFE
'12 Challenger SRT8 392/6-speed
'99 XJ 4x4 4.0/AX15, '14 WK2 4x4 3.6/8HP
Re: Leak at Timing Chain Cover [Re: 440Magnum] #4114174 06/03/16 10:43 AM
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Trav Offline
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No bolts go through the cover, its mounted on the left side of the engine. Good point about verifying the leak source especially when repair work was done close to it.


ASE L1, Master. Deutsch Meisterbrief.
Re: Leak at Timing Chain Cover [Re: Trav] #4114183 06/03/16 10:59 AM
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SavagePatch Offline OP
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Originally Posted By: Trav
Good point about verifying the leak source especially when repair work was done close to it.


Will do. The PS fluid is red Dexron III though and the drips are a dirty amber.

Re: Leak at Timing Chain Cover [Re: SavagePatch] #4114224 06/03/16 11:56 AM
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Trav Offline
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Clean it well and use a UV dye kit in the oil, it will show you the exact point of the leak. Amazon has them cheap enough as do most parts stores.
You can also get dye for coolant (GM dexcool needs a special dye) The dye is harmless in the oil so no need for an oil change after use.
Check at night or low light condition, the leak and its source will be clear.

http://www.amazon.com/gp/product/B000NBW...98QJER6Z9BMDWCH

http://www.amazon.com/Interdynamics-374C...7411H2D7QPKAP72


ASE L1, Master. Deutsch Meisterbrief.
Re: Leak at Timing Chain Cover [Re: Trav] #4114260 06/03/16 12:42 PM
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larryinnewyork Offline
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Originally Posted By: Trav
Clean it well and use a UV dye kit in the oil, it will show you the exact point of the leak. Amazon has them cheap enough as do most parts stores.
You can also get dye for coolant (GM dexcool needs a special dye) The dye is harmless in the oil so no need for an oil change after use.
Check at night or low light condition, the leak and its source will be clear.

http://www.amazon.com/gp/product/B000NBW...98QJER6Z9BMDWCH

http://www.amazon.com/Interdynamics-374C...7411H2D7QPKAP72


I second the idea of using "dye".
Get the 'oil base', compatible with oils, (not for coolant).
Also, get the Ultra-Violet FLASHLIGHT.
Very inexpensive at Advance Auto, or Auto Zone.

I just had my Timing Cover GASKET replaced by indy. mechanic, 7 hrs. of labor.
Two days later I see something leaking on my garage floor,,,, dam!
I put the 'dye' into the motor oil and next day,,,, guess what ?
On the outside of timing cover I see the 'dye' glowing.
I went back to the mechanic and talked about the leak and using the dye.

My appointment to have it redone (under warranty) is in 2 Weeks.

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