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This came from the Vintage VW list... -----Original Message----- From: Bentley Wolfe <bwolfe@MACROMEDIA.COM> To: VintagVW@listproc.sjsu.edu <VintagVW@listproc.sjsu.edu> Date: Monday, June 22, 1998 10:11 AM Subject: Fwd: New info >Some of you may remember that last fall when Don Tucker rebuilt my engine >it seized after 2000 miles. The engine Don built for his Thing did the same >exact thing. We suspected that the shop that did our align-boring may have >been having problems. However, Don just sent me this email which sheds some >light on the situation. If you're in the middle of a rebuild it's worth >reading. > >Bentley > > > >> >>Hi Bentley >> >>I was over at Piston and Plugs on Saturday and got to talking with Glenn >about >>my suspicions of bad align boring from Knight's. He asked when the problems >>occurred and when I told him he said their align bore was NOT the problem >with >>our engines, nor was the assembly process. He said that a bad batch of >bearings >>came through with the no. 4 bearing having the wrong type of babbit or the >>babbit was too thick or something. He had 5 engines in a row do the same >thing >>ours did and at least 2 other local shops had the same failures, all fresh >>rebuilds. They finally checked the bearings at high temp and found that >the gap >>between the bearing and the crank was too small by .001 in. In the >engines like >>ours that ran a while before the seized, the cranks were on the small end >of the >>tolerance which gave them a little more gap. He said that the only bearings >>that had the problem were the ones in the yellow cube shaped box, that the >ones >>in the blue box were okay. The last set I used in your engine were in the >blue >>box. >> >>Glen also said that they had not had the problem since that time. If you >are >>still on the list, you might want to pass this info along, it may keep >someone >>else from having the problem. I'm going to check tonight to see if the >bearings >>have a lot number on them, I think I have the boxes, I saved the good >pieces. >>If there is a lot number I will get back with you if you want to pass it >on to >>the list. >> >>Don >> >