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#2413452 - 12/05/17 12:47 AM 360 leaks water from lower timing cover bolt
70FJ5383 Offline
enthusiast

Registered: 03/22/04
Posts: 322
Loc: Toledo, Ohio
Bottom bolt on the left hand side of the timing cover. Just above the oil pan. It just started leaking the other day, antifreeze from around that bolt or maybe the gasket but I think it’s around the bolt. Does it go through into the water jacket? If so will silicone fix it?

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#2413459 - 12/05/17 01:52 AM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
EV2Bird Offline
On Vacation

Registered: 06/23/14
Posts: 3116
Loc: Kansas Roads Between 0 and 140...
Yes it goes through, id just drain it while its hot so it self dries and use a good sealer on the bolt. I like the dark thick airplane gasket goop or simple rtv.

But it seems you know the deal already.

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#2413468 - 12/05/17 04:35 AM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
70FJ5383 Offline
enthusiast

Registered: 03/22/04
Posts: 322
Loc: Toledo, Ohio
Wasn’t sure. And if rtv was ok.
Thanks

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#2413488 - 12/05/17 07:54 AM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
Θάνατος Offline
supercuda

Registered: 09/04/07
Posts: 12836
Loc: betwixt the land of the living...
I would not use RTV, Teflon tape is better. It will seal and it will keep the bolt from corroding itself solid tot he block.

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#2413496 - 12/05/17 08:11 AM Re: 360 leaks water from lower timing cover bolt [Re: Θάνατος]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 33030
Loc: Lincoln Nebraska
Quote:
I would not use RTV,
X2, I would use some thick cement like permatex #2 or Indian head shellac.
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#2413529 - 12/05/17 09:56 AM Re: 360 leaks water from lower timing cover bolt [Re: Θάνατος]
a12rag Offline
top fuel

Registered: 04/23/07
Posts: 1921
Loc: Calgary, Alberta Canada
Originally Posted By Supercuda
I would not use RTV, Teflon tape is better. It will seal and it will keep the bolt from corroding itself solid tot he block.


X2 . . . teflon tape the bolt . . .

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#2413665 - 12/05/17 02:12 PM Re: 360 leaks water from lower timing cover bolt [Re: a12rag]
dogdays Offline
I Live Here

Registered: 01/20/03
Posts: 15923
RTV won't stick to a wet surface. The non-hardening Permatex (stinky, in a small tube)is good and really all old timers used back in the day. Gasket shellac isn't meant for that use.
Teflon tape or paste will work. Hylomar blue works. FelPro TIGHT is both a sealer and locker.

Or you could put a little stop-leak in the radiator and it'll stop leaking, without disassembly.

R.

PS: I vote for Stop-leak. BTW, that isn't the worst thing you can do from the front of the engine. It is possible to use a bolt long enough that it penetrates the cylinder wall.

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#2413954 - 12/05/17 09:24 PM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
qwkmopardan Offline
super stock

Registered: 03/26/08
Posts: 808
Loc: Affton MO
The lowest bolt does not go through to water. the second from the bottom is the one that is through to coolant. Probably running down and looks like it is dripping from the lowest bolt. Same thing on other side, except that bolt is behind the water pump.

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#2413968 - 12/05/17 09:35 PM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
Magnum Offline
master

Registered: 01/24/03
Posts: 5599
Loc: Hamilton, Ontario Canada
I prefer to seal straight threads with silicone.
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#2414070 - 12/06/17 05:18 AM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
dvw Offline
master

Registered: 03/16/06
Posts: 6672
Loc: MI, usa
Liquid Teflon sealer will seal threads with no issue. Brand X uses it on head bolts that go into the water jacket. There may be a bigger issue. The timing cover may be corroded or the timing cover gasket split. This can allow coolant to migrate from the water pump passage out the bolt. It may also allow coolant to get into the oil.
Doug

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#2414147 - 12/06/17 09:58 AM Re: 360 leaks water from lower timing cover bolt [Re: dvw]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 33030
Loc: Lincoln Nebraska
Agreed (on the leak potentially being nearby). I would drain the coolant & screw in an NPT "tank valve" (less than $3 at O'reillys) into the cooling temp sensor port at the top rear of the block & with shop air pump it up to 15 lbs & see if it holds. You can spray a soapy water solution around potential areas to see if it starts to bubble (for external leaks) & there is a "bubble up" (iirc) solution that reportedly bubbles more readily but the dish soap in some water has worked for me. EDIT on second thought I would pump it up to just 10 for a start.


Attachments
SAM_0604.JPG




Edited by RapidRobert (12/08/17 06:38 AM)
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#2415229 - 12/08/17 11:12 AM Re: 360 leaks water from lower timing cover bolt [Re: dvw]
Joesixpack Offline
I Live Here

Registered: 01/21/03
Posts: 10724
Loc: APACHE JUNCTION AZ
Have same problem with bolt above timing tab, went to tighten it and it just spins....threads in timing cover must be stripped..has anyone put a heli coil in the timing cover still on the engine before or do i have to remove it ?

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#2415246 - 12/08/17 11:47 AM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
Paul_Fancsali Offline
master

Registered: 01/21/03
Posts: 2893
Drain block and coat bolt with sealer let it set overnight and then add anti freeze Do do this if you cannot maintain at least 50+ degree if sealer is silicone

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#2415401 - 12/08/17 05:40 PM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
cudaman1969 Offline
master

Registered: 01/25/04
Posts: 3872
Loc: fredericksburg,va
One more thing to think about, the cover is aluminum, block cast iron. Electrolysis. Over time the cover corrodes, I've replaced a few because of this problem. What looks like a leak around a bolt turns out to be a tc cover. A bad sign? Moisture in the oil. Look at it good, water will travel far from where it actually leaks. Other than a messed up gasket, bad cover is the only time I had a leak.

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#2415422 - 12/08/17 06:31 PM Re: 360 leaks water from lower timing cover bolt [Re: Joesixpack]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 33030
Loc: Lincoln Nebraska
Originally Posted By Joesixpack
Have same problem with bolt above timing tab, went to tighten it
Which bolt (hole) in particular is that?
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#2416161 - 12/10/17 10:51 AM Re: 360 leaks water from lower timing cover bolt [Re: RapidRobert]
Joesixpack Offline
I Live Here

Registered: 01/21/03
Posts: 10724
Loc: APACHE JUNCTION AZ
lower right hand corner of water pump. attaches water pump to timing cover.

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#2416940 - 12/11/17 05:22 PM Re: 360 leaks water from lower timing cover bolt [Re: Joesixpack]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 33030
Loc: Lincoln Nebraska
those lower threads on the aluminum timing cover are a weak 11/16" deep & open on the back side & go directly into the timing chain area/eng oil & it uses a 3/8 bolt so I'm thinking if you could block the very back with something fairly firm just to temporarily plug the rear end of that passage for your work then drill/tap a good amount of the threads then carefully/lightly blow the chips out the front (the critical part) & I would use brake kleen as opposed to shop air & either helicoil or just drill/metric tap to the next larger metric size/use a metric bolt. Use grease on the tap to catch alot of debris. EDIT Another option might be to permanently JB weld a stud in there


Edited by RapidRobert (12/11/17 08:11 PM)
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live every 24 hour block of time like it's your last day on earth

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#2418177 - 12/13/17 06:55 PM Re: 360 leaks water from lower timing cover bolt [Re: RapidRobert]
Joesixpack Offline
I Live Here

Registered: 01/21/03
Posts: 10724
Loc: APACHE JUNCTION AZ
Yea i figured as much, just bought a used timing cover, will heli coil all the threads in it first and just replace the cover.

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#2419811 - 12/17/17 09:52 AM Re: 360 leaks water from lower timing cover bolt [Re: Joesixpack]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 33030
Loc: Lincoln Nebraska
I wouldn't think you would need to go to all that trouble (helicoiling undamaged threads). I think the one thread just went bad (they are aluminum) & after this you will be OK. Just me I'd clean em (& the bolts) & use some sealer & call it good.
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live every 24 hour block of time like it's your last day on earth

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#2419835 - 12/17/17 10:30 AM Re: 360 leaks water from lower timing cover bolt [Re: 70FJ5383]
Θάνατος Offline
supercuda

Registered: 09/04/07
Posts: 12836
Loc: betwixt the land of the living...
Putting in helicoils in a timing cover on the bench isn't a lot of effort. doing it while the timing cover is installed in the vehicle is another story.

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