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Join Date: Aug 2009
Location: Warner Robins, GA
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80 Euro Tensioner Rebuild

I've got an 80 Euro with an M28/09 engine. I'm doing the TB/WP and removing about 30lbs of grease and debris (much of it appears to be so old it's probably from the Fatherland). The tensioner boot was hard as steel, and cracked badly. I've painstakingly cleaned every part of it and, now that I've finally found the correct boot, am ready to reassemble.

Does anyone have a recommendation for which oil to use in the tensioner? I've read many suggestions but they all seem to pertain to the newer model years. The WSM I've got says to use "SAE 90 transmission oil". Is there an update to this for the older models?
Old 10-16-2010, 04:14 PM
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928: Serial Enabler
 
Join Date: Sep 2007
Location: Elkhart, Indiana
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The only bad thing about that oil is it smells of sulfur.

I use 15W50 engine oil.

Mr. Merlin uses STP.

It doesn't matter much.

Congrats on tackling the job. Sure feels good to clean one up and put it in running order again.

You've got the right belt tooth profile to match the gear tooth pattern, right?

Post some pictures!

Last edited by Landseer; 10-16-2010 at 05:57 PM..
Old 10-16-2010, 05:54 PM
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Petie3rd
 
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on the engines with the back side of the tensioner open to the block, i have found that using the STP will increase the length of time the oil stays in the tensioner the thinner oil seems to run out quicker.
On the early engines the tensioner is filled prior to installing the boot, these tensioners dont let the oil go to the block
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Old 10-16-2010, 06:24 PM
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928: Serial Enabler
 
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I didn't know that.

All 4.5 engines or is the cutoff earlier than that?
Old 10-17-2010, 01:50 AM
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Petie3rd
 
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Chris IIRC it is all of the smaller diameter tensioners, are sealed.

Note the new boot will be a bigger version so the replacement should also have what looks like a small black rubber band this part is put on the tensioner first then the new tensioner boot is fitted as its a bit bigger. ( so your new boot should come with 2 parts , Roger has these)

Note that the belt tension is set to a reduced number on the early tensioners due to the internal washers being a smaller diameter thus they dont have as much give or release when hot.

The correct tension for the early tensioner is a 4.0 to 4.2 this would equate to a setting on the Kempf tool of just at the lower edge of the window.

Note also that there is not a gasket thats put on for the sealed tensioners.


If you do have a gasket i suggest to use Hondabond on the gasket to assist in sealing as they all seem to leak this will just reduce the amount of leakage
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1988 S4 Auto , Color is Elfenbein Perlglanz, Pearl Gray
1985 Porsche 928 Euro 5 speed , Black on Black 16V
2011 BMW K1300S Magma red

Last edited by Mrmerlin; 10-17-2010 at 05:40 AM..
Old 10-17-2010, 05:37 AM
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928: Serial Enabler
 
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I've worked only with 84,5,6,7.
They all use gaskets.
Old 10-17-2010, 11:56 AM
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Old 10-17-2010, 11:56 AM
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