Recently I had the heat exchangers out of our 12v71's for cleaning. When I put the HE's back in I changed the glands, orings and all gaskets. After running a bit i started to see salt weeping coming through the orings and glands on the HE discharge side on the port engine athigher rpm.
In thinking about this problem and possible causes I am thinking there might be a couple scenarios that i could up against:
1) I somehow have the wrong O-rings installed. I called pc industries and had them look at the diameter of the Detroit orings vs the aftermarket orings and they are the same and i used the same part number on the other side. The oring seal p/n i am using is5167746
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2) The exhaust sprayer may be clogged which is creating excessive pressure in the heat exchanger. I haven't looked but have read on this forum that they need to be cleaned from time to time.
I would suspect something else in the cooling system but the flow of water is salt only and i didn't have any other issues with the cooling system that i could tell. However I haven't checked the coolant yet so i need to look a little closer.
Anyone have any experience with a similar issue?
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05-30-2018 04:24 PM #1
12-71 Heat Exchanger gland weep holes leaking?
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Re: 12-71 Heat Exchanger gland weep holes leaking?
Retighten when hot and see if that works.
Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC
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Re: 12-71 Heat Exchanger gland weep holes leaking?
Ours had o-rings and gaskets on the end plates. The o-rings had to be in between the gasket and end plate.
Regards
Dan
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05-31-2018 11:51 AM #4
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05-31-2018 12:41 PM #5Senior Member
- Join Date
- Feb 2009
- Posts
- 79
Re: 12-71 Heat Exchanger gland weep holes leaking?
Did you install new metal rings also? They compress after used.
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05-31-2018 01:35 PM #6
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Re: 12-71 Heat Exchanger gland weep holes leaking?
Just talking about the exchanger assembly part of the cooler.
I leave in an area where barnacles run heavy and rebuild my exchangers ever other year.
I have experienced the leak you are referring to (the very first time I serviced mine) then I learned.
Few more comments here:- There are an odd number of paper gaskets. Two gaskets on the side with NO O-rings and one gasket on the side with the O-rings. Sometimes it is not intuitive about where they go. If you use 4 gaskets to assemble the unit (two on the side with the O-rings) you will not be able to get enough compression on the O-rings and they will leak.
- No not reuse the crush rings.
- I found that the genuine DD O-rings and crush rings work better than aftermarket or O-ring crosses.
- If you do use aftermarket O-rings make sure that they are made from a material that can withstand constant exposure to both salt water and the coolant type you use.
- All of the gasket and O-ring surfaces need to be Very Very clean before re-assembly.
- Use a O-Ring assembly lube on the O-Rings during the assembly of that section of the exchanger.
- Do not use RTV to seal the gaskets or the O-ring surfaces. If you must use a sealant then use a proper thin gasket sealer compound!!!!
- You have to tighten up everything in a very uniform fashion!!!
- The design of this sealing assembly is that everything goes up rigid and should not need to be re-torqued after assembly.
Tim
1979 53' MY Hull #566
KNOW PRESSURE
Hampton, Virginia
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05-31-2018 03:40 PM #8
Re: 12-71 Heat Exchanger gland weep holes leaking?
These are all great points. I used gasket tack to hold the gaskets on and no RTV. I did however have some tank imperfections that required jbweld to smooth out and seal. There are a couple bolts on the vertical part of the gasket that dont have much material behind them which can result in a bolt sealing leak if you are not careful.
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05-31-2018 03:49 PM #9
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Re: 12-71 Heat Exchanger gland weep holes leaking?
Hi John,
Sent you a copy of the exploded view.Tim
1979 53' MY Hull #566
KNOW PRESSURE
Hampton, Virginia