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740 Turbo '92-oil seals issues 700 1992

posted by  arterialturns on  Sat Jun 23 15:52 CST 2007
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last visit: Tue Jul 24 15:53 CST 2007
[RELATED]

Changed front cam, crankshaft and intermediate oil seals as well as timing cover gasket (of which there was no residue from the old one!). Fired it up, it started on 2nd try and ran good (except for the oil leaking from the bottom of the new timing belt cover!). Took it all apart, assuming that gasket failed (as I realized I had not allowed much time for the gasket sealant to dry properly), to find that the plate between the crankshaft pulley and the crankshaft sprocket had slipped (during reassembly perhaps?). This caused the tab on the sprocket to indent and distort said plate, as well as somewhat distorting the tab itself. Also, some oil had collected under where crankshaft & intermediate seals are. Question #1: Did I do something wrong when I installed the two lower seals (do they need to be pushed in further?). Question #2: Is there any way I should even consider trying to use the abovementioned parts, or do I have to get new pulley/plate/etc. (and-if so-what did I do to mess them up?)? Thanks for your time.
--Matt E.








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    740 Turbo '92-oil seals issues 700 1992

    posted by  someone claiming to be nate on  Mon Jun 25 10:30 CST 2007 [RELATED]

    1. The seals should ride on a "fresh" part of the shaft. If the previous seal wore a groove on the shaft, position the new seal inside or outside of the groove. The crank seal in particular has quite a bit of room to choose from.

    2. You'll have to pull everything apart to get a better idea. If the key hasn't been smooshed right off the gear, I'd probably reuse it. The tab only positions, it isn't strong enough to drive anything. It's tempting to wiggle the gear & pulley back onto the crank when reassembling...and it doesn't take much to lose your alignment between the tab and everything else. Once that alignment is lost, torquing the pulley nut is more than enough to deform the tab and washers. Truth be told, I had done the same thing at my timing belt change four years ago. ...Didn't even notice until putting everything back together when changing the belt this spring.

    Good luck getting everything the way you want it. A leak-free engine is a wonderful thing.








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      740 Turbo '92-oil seals issues 700 1992

      posted by  arterialturns on  Mon Jun 25 18:27 CST 2007
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      last visit: Tue Jul 24 15:53 CST 2007
      [RELATED]

      If you copy

      http://brickboard.com/IMAGELIB/index.htm?uid=40587&pix_type=&js_link=1&sort=1&model=

      into your browser, you can view 3 photos of the offending parts.
      --Matt E.









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        740 Turbo '92-oil seals issues 700 1992

        posted by  someone claiming to be nate on  Wed Jun 27 09:56 CST 2007 [RELATED]

        Since no one else is jumping in...

        If it were my car, I'd probably file down the new hump on the pulley, clean everything up, try to flatten the washer/spacer, and put it back together. However, the weather is warm and the wife is amazingly patient about having the car break down...so I might not be as cautious as is ideal. If the pulley (aka the harmonic balancer) has not yet been replaced, you will need to eventually as the rubber breaks down. Perhaps now is a good time. The crank gear is not terribly expensive from FCP Groton, and sometimes peace-of-mind is worth it.

        Good luck sealing up the oil leak as well.








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          740 Turbo '92-oil seals issues 700 1992

          posted by  arterialturns on  Tue Jul 24 15:59 CST 2007
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          last visit: Tue Jul 24 15:53 CST 2007
          [RELATED]

          Thanks for the tips. Decided to replace the pulley, washer and sprocket. Got it all back together again and still it leaked. It's hard to tell, but it looks like it may be coming from the intermediate shaft. If not that, possibly the gasket on the timing cover. Anyway, thanks.








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            740 Turbo '92-oil seals issues 700 1992

            posted by  Rolyak on  Wed Jul 25 06:24 CST 2007
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            last visit: Fri Oct 24 08:03 CST 2014
            [RELATED]

            Most gaskets do not require a sealant, pure cellulose (paper with no binder) might?

            I do gasket failure analysis for Victor gaskets and have seen numerous failures where sealant allows the gasket to extrude and fracture.

            RTV sealant causes the most problems, it is a gap filler and can really "lubricate" a gasket!

            The seal lip can get flipped during installation or the shaft surface may be grooved or damaged also.

            Good luck!







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