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PostPosted: Wed Nov 15, 2017 7:51 pm 
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Joined: Wed Apr 09, 2014 4:09 pm
Posts: 32
Year and Trim: 1989 Bonneville SSE
Hi there. I am freaking out. Just had my 89 bonnie's sse engine replaced. Got a 3800 231 in vin c from a 90 reatta. Had the block and heads gone thru by a very reputable machine shop man, all new rings, quality felpro gaskets all around, new radiator, etc. We thought everything was ready, my mechanic friend attempted to put plain water first into radiator to check for leaks. Sure enough, water started to pour out on the left side of engine, just below throttle body. We stripped it down, he didn't like the looks of a few sensors just under the TB, so we replaced them, new gaskets, gooped up with silicone where appropriate, still leaking. Will next do a pressure test on system see if he can pinpoint the problem. Im not there with him right now as I am working. Anyone have any thoughts? He initially has said he didn't think it was the head gaskets as the water level seemed to leak at the very top of being filled, then stops. From underneath the car the water is cascading on both sides of the transaxel, for whats thats worth.

He thinks the leak happens when the water level is above the head gaskets therefore they are holding pressure ok. Again, this is just in pouring water into the radiator, squeezing the top rad hose. No starting of car...HELP!


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PostPosted: Wed Nov 15, 2017 10:35 pm 
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Joined: Wed Apr 09, 2014 4:09 pm
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Year and Trim: 1989 Bonneville SSE
UPDATE: The pressure test shows that the throttle body pipe that brings warm water into the throttle body is the culprit! under pressure water shot out of there..so I am in search of part number 25533986, the tube itself, and corresponding parts 25533988 and 89..the o rings for this pipe. Any suggestions where to find? The oem GM stuff online all say discontinued part...


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PostPosted: Thu Nov 16, 2017 12:39 am 
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Location: Isanti, MN
Year and Trim: 2000 SLE Saved from the scrapyard.
http://oemcats.com/oem-parts/25533986.html

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PostPosted: Thu Nov 16, 2017 2:09 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4256
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
Unless the tube on your engine is damaged, you should just have to find the O-rings that fit.

This can be a bit of trial and error to determine if the o-ring is metric or SAE, and how thick it should be. usually accomplished by measuring the OD of the hole and the ID of the groove in the pipe that the oring sits in. General rule of thumb is 25% compression of the O-ring in the joint. You can get O-rings from many places, McMaster has SAE and metric O-rings you can get in individual sizes, generally under $12 for a pack of 2-5 depending on the type.

I would avoid the harbor freight o-rings, about 40% of them have surface deformations or ridges that won't seal right, unless you have a good eye it's not worth the trouble.

If you can't find the OE parts you're looking for, that's the only other alternative.

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Runs:
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'97 Chevy Camaro - 3800, T5, T-tops, my DD
'05 Cadillac STS - V8, AWD, her DD
'89 Buick LeSabre Limited - winter DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 project
'92 Pontiac Bonneville SSE future project

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'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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PostPosted: Wed Nov 22, 2017 6:57 pm 
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Year and Trim: 1989 Bonneville SSE
Thanks gents..As we are in sunny so california, we went with option C...plug the darn thing so no water will go through the throttle body any longer...Research online indicated this was ok to do, as long as the car is operated when its not cold out.


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PostPosted: Wed Nov 22, 2017 10:01 pm 
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Joined: Tue May 27, 2008 8:53 am
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Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
If it's what I think it is, it's there simply to prevent the throttle body from icing up. I highly doubt 'sunny California' will ever see any issues, especially with the intake hanging straight over the exhaust crossover.

Even if it does happen to crop up, any competent and mechanically minded driver can detect the problem it would cause, and should be able to account for it before it became dangerous.

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