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Registered
Join Date: Nov 2001
Location: Central Kentucky
Posts: 729
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?? Have I screwed up this rod buhing?
OK, wish I had a decent picture but here is the issue. In attempting to bang #5 cyliners wrist pin back in to place I must have managed to form a small "lip" on the inside of the small end bushing. We carefully emery papered that off and used the puller device (Chris Bennet recommends) to draw the wrist pin in, went smoothly for 7-8 mm then lots of resistance. We removed the wrist pin and there is a definite lip just ahead of where the wrist pin made it too. Just enough so your fingernail catches. We gently emeried this but same result when we pulled it in (went a little further in)
I geuss I am scared to remove too much. All of the pins are VERY tight fits, I have not measured tolerance but moderate force is required to reinsert each. Do I have a real problem, as in crack the case and get the rod rebushed? or do I just get over my fears and continue gently sanding the bushing? All advice appreciated as I am anxious to get this baby back together.
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Richard Lane 1978 911SC 1973 "Clean" RS clone |
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06-04-2006, 05:47 PM
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dont know about the damage done to the bearing surface but when i installed mine i heated each piston very gently with a small propane torch-just enough to get some handy expansion of the ally. I just played the flame real gently around the area that the pin goes in, until the pin started to noticably move easier. the pins just slid in!
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Andy 1980 SC soon to be big hp 3.3t powered 73RSR Replica (well, I'm keeping the engine but everything else is going  )
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06-05-2006, 02:21 PM
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Location: Central Kentucky
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I would but removed the pistons and cylinders as a unit so it would bve a bit more difficult, any thoughts from the experienced folks on here?
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Richard Lane 1978 911SC 1973 "Clean" RS clone |
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06-07-2006, 05:10 PM
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Location: Central Kentucky
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anybody with some advice for me?
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Richard Lane 1978 911SC 1973 "Clean" RS clone |
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06-10-2006, 04:20 AM
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Join Date: Mar 2005
Posts: 743
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Sorry for slow response.
It sound like all the pin bushings need to be looked at. Although the piston should always be very tight when cold, so that heat is a help as suggested by adaomakin, the pin bush is not. it is specified at an easy sliding fit, oiled.. If tighter than this, then the tolerances are IMHO too tight..oiling will be a problem and you might even end up with no movement at the rod/pin bearing, only at the piston... Kind regards David |
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06-10-2006, 04:27 AM
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