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Join Date: Oct 2007
Location: Rye, New Hampshire
Posts: 374
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Small Coolant leak
While doing the MM I saw some coolant at the bottom of the tensioner around the lowest bolt. I did the TB/WP about 5K miles ago and I think I've added a little bit of coolant since. ( a quart maybe).
The only coolant is at the bottom of the tensioner and a little on the bolts of the AC compressor. Where's a good place to go looking first? Any bolts on the tensioner go into a coolant galley? It's an 84US. My 928 is starting to remind me of Rodney Dangerfield line: "I get up and a button falls off, I pick up my briefcase and the handle falls off I'm afraid to go to the bathroom. " Everytime I do a project i find 10 more things that need fixing..
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1979 Porsche 911 Black on Black widebody 3.2 - SOLD 2015 Jeep Wrangler Sport Unlimited - White 1984 Porsche 928s Black on Black - SOLD |
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05-31-2012, 06:19 PM
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I would look at both ends of where the large radiator hose attaches on the passanger side and also the smaller coolant hose that goes from the bridge to that metal tube going to the expansion tank. Leaks at either end of those seem to drip off low points in that area.
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1979 928 85 Euro 2v motor,S4 Brakes and suspension, 1988 951 street legal track car(sold) Neon SRT4 track car |
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05-31-2012, 06:29 PM
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Quote:
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1986 928S 32 valve engine All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires. Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L. Latest addition: 2000 BMW Z3 Roadster |
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06-01-2012, 05:06 AM
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Quote:
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1979 928 85 Euro 2v motor,S4 Brakes and suspension, 1988 951 street legal track car(sold) Neon SRT4 track car |
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06-01-2012, 05:53 AM
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Wouldn't happen to know which bolt is was would you?
I Didn't see it listed in the WSM. Since I'm starting to get back to normal after doing the motor mounts/opg fiasco it's almost time to jump back in to another project. My Leak is similar to the picture on this link a couple of drops at the bottom of the tensioner. Coolant Leak, need help? - Rennlist Discussion Forums But not as bad.
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1979 Porsche 911 Black on Black widebody 3.2 - SOLD 2015 Jeep Wrangler Sport Unlimited - White 1984 Porsche 928s Black on Black - SOLD |
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06-11-2012, 05:48 PM
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Join Date: Mar 2012
Location: Ma
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Rebuilt water pumps need sealant on the tensioner pulley spindle.
Pic from Dwaynes Garage 
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______________________________________________ Paul 85 Euro 5 speed 89 S4 60k |
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06-11-2012, 06:25 PM
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I know when I got my Laso, I didn't remove the pin, but I'm trying to remember if it came "pre sealed". Was there a bolt on the tensionor itself that went into the jacket?
I'll have to take the cover off and take a gander next week.
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1979 Porsche 911 Black on Black widebody 3.2 - SOLD 2015 Jeep Wrangler Sport Unlimited - White 1984 Porsche 928s Black on Black - SOLD |
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06-12-2012, 02:44 AM
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On the tensioner its oil not coolant.
Pic from Dwaynes Garage 
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______________________________________________ Paul 85 Euro 5 speed 89 S4 60k |
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06-12-2012, 03:22 AM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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in this last picture you can use PTFE pipe sealant made by Loctite
the 574 would not be a good choice and the sealant goes onto the bolt
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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06-14-2012, 08:36 AM
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I remember when I did my TB/WF, the center bolt at the top of the tensionor broke well below surface, so I had to drill it out and helocoil.
I'm wondering if I went too deep when drilling, does that hole go into a water jacket?
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1979 Porsche 911 Black on Black widebody 3.2 - SOLD 2015 Jeep Wrangler Sport Unlimited - White 1984 Porsche 928s Black on Black - SOLD |
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06-15-2012, 05:33 AM
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1988 Porsche 951
1
