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#1 |
Registered User
Join Date: Jun 2010
Location: Parkville, MD
Posts: 163
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Paper gasket or silicone for water pump?
I'm in the process of tracking down a S - L - O - W coolant leak on my truck. Everything is new, which is why this is particularly frustrating. Long sorry short, I was getting tired of the drain, fix, refill, still leaking approach, so the water pump is now off. (I'd thought it may have been a slow leak from the back cover of the pump.)
In mounting the pump back to the block, I have a set of the paper/cardboard gaskets, and which I used originally. But I was wondering if these are a weak link, or if they're a tried and true way of sealing this spot. So before I threw it back together, I thought I'd ask whether there's a consensus about using the standard gaskets or gray silicone (or both). When I took the pump off, the gaskets were wet, but I'm assuming that was just from the process of taking it out and the coolant that was behind the pump. The only good news is that after all of this, my problem should be solved (unless I put something back together wrong) because everything else has been checked and rechecked. Thanks! Patrick Posted via Mobile Device |
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#2 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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My personal preference is use both. I coat both sides of the gasket's with sealer and install.
![]() Now for the ? of the leak. Do u run a recovery tank? If not I suggest u start and if not then where is your water level at when the truck is cold? if it's to high in the radaitor then it will boil out and the cold level will be less the next time u check it.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#3 |
Registered User
![]() Join Date: Jun 2012
Location: Fitchburg,Mass
Posts: 737
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Re: Paper gasket or silicone for water pump?
I would use the gasket and a sealant. I have been using Edelbrocks gasgacinch for a while with great results..
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62 Willys 4wd Pickup : 72 C-10 swb 504 stroker ![]() |
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#4 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Paper gasket or silicone for water pump?
Paper gaskets with a little dab of Permatex #2 or Hondabond or similar glue is all you need.
There is no need for silicone under any circumstances. There's exactly two places to use silicone on a Chevy V8 engine, at the ends of the intake manifold and at the corners of the oil pan gaskets. As long as you get the surfaces clean with a razor blade or gasket scraper and use proper torque procedures you will be fine. Posted via Mobile Device |
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#5 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: Paper gasket or silicone for water pump?
I don't use any water pump/timing cover/valve cover/oil pan (etc.) gaskets at all. It is all grey silicone.
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#6 |
Registered User
Join Date: Jun 2010
Location: Parkville, MD
Posts: 163
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Re: Paper gasket or silicone for water pump?
Thanks everyone.
It really was a small slow leak - about 2-3 drops per min or so. It was coming from somewhere near the pump, and I'd already checked the lower radiator hose, heater hose, heater hose nipple, & even replaced and added sealer to the mounting bolts. Then in between each "fix" I had to wipe down everything - crossmember etc - to make sure it was still a leak and not just residue. I'm sure taking the pump off wasn't the most logical or rational step, but I was just so disgusted and frustrated with this leak that it was halfway off before I knew it. Hopefully, this will be the last time for a very long time! Posted via Mobile Device |
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#7 | |
Registered User
Join Date: Jun 2010
Location: Parkville, MD
Posts: 163
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Re: Paper gasket or silicone for water pump?
Quote:
The recovery tank is definitely on my short list of projects to get done. Posted via Mobile Device |
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#8 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: Paper gasket or silicone for water pump?
The lower right water pump bolt goes into the water jacket and needs sealed, or it will leak.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#9 |
Registered User
Join Date: Jun 2010
Location: Parkville, MD
Posts: 163
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Re: Paper gasket or silicone for water pump?
Thanks Lee - I wasn't taking any chances though. I put sealer on all 4 bolts. This leak will die!
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#10 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,643
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Re: Paper gasket or silicone for water pump?
x2..... no silicone, I've seen it leak too often.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#11 |
Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: Paper gasket or silicone for water pump?
Paper with a thin film of #2 or Aviation Permatex 'form a gasket'.
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1969 c-10 Step Side Long Bed. I-6 250cid = ![]() |
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#12 |
Registered User
Join Date: Sep 2011
Location: olathe kansas
Posts: 238
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Re: Paper gasket or silicone for water pump?
Use a anaerobic gasket maker. Will fill a .010 gap and will never leak, use your paper gasket it with it. I have mounted water pumps with no gasket and never had a problem
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