Re: Water pump: install new one while replacing serp belt? - Bulletin Board

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Re: Water pump: install new one while replacing serp belt?
Posted by thetallguy [Email] (#1698) [Profile/Gallery] (more from thetallguy) on Thu, 21 Dec 2017 06:27:41

In Reply to: Re: Water pump: install new one while replacing serp belt?, David Ingram, Tue, 19 Dec 2017 08:20:40
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I have a couple of suggestions and observations. My 9000 is at plus 400K miles with the original pump. Recently, I did have a leak between the block and the pump connection which I solved with a new o-ring. The pump was fine so I left it. Another year and 35K miles now gone. One thing that may help preserve the belt life and the auxiliary components is the maintenance of the hydraulic belt tensioner. I noticed years ago that the alloy bushing on one of the tensioner mounting bolts (the other is steel) wallowed out after 80K miles. This alloy bushing fits inside the the black nylon insert on the tensioner "barrel". Other 9000's in the salvage yard also had the same problem. I fixed mine at 180K (car) miles by turning down (lathe) the bushing to return it to "round" and then added a brass tube to return it to the original diameter. More recently, I replaced the nylon bushing from an old unit off the steel end. My tensioner still exibits good smooth initial travel with tension firming way way up at the top of the travel as the hydraulic oil is compressed/moves through the unit. Perhaps I'm just lucky but I have gone 230K without needing a replacement. A recent check confirmed that it's still A-OK. Not the case for the idler pulleys so do check those. If you do not have a lathe a bolt through the bushing which can then be chucked into a hand drill will allow one to "turn" the bushing to "round" using a file to cut the material. This technique does side load the bearings on the drill (not best practice) but it does get the job done on lots of projects which might not need or want the use of a lathe. The only other maintenance item on the tensioner is the addition/ installation of some o-ring seals on either side of the pivot's roller bearings plus a re-lube. It appears that a seal was intended here but, at least on mine, no seals were in place.

->Posting last edited on Fri, 22 Dec 2017 04:16:58.
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