I am just rebuilding my PI engine and I have about 8 thou end float with STD thrust washers. Should I put a +5thou washer or leave it? I can\'t decide!
Thanks
Crankshaft end float
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Alan Chatterton
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David Withers
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Hello Brian,
With STD thrust washers, the end float is within spec at 0.008\", but fitting +5 thrust washers will bring it right out of spec at 0.003\", i.e. half the minimum specified float.
The 0.006 - 0.008\" limits were specified for a reason and 0.003\" is far too little in my view. I would keep to STD size or, as Alec said, get some +5 washers ground down to +2 if you want to take the end float to the allowable minimum.
I assume the tight limits on the 2.5 are to avoid the crankshaft hitting the block due to the longer crank throw and the 25% heavier clutch end loading. I\'d be surprised if there is a great risk of the thrust washers falling out on the 2.5 engine until beyond the 2000 maximum of 0.014\" end float, but perhaps someone will know different.
Incidentally, one of my jobs as an apprentice 45 years ago was to grind thousands of +0.003\" thrust washers to STD because our supplier had run out of STD washers for our diesel engine production line. I had to hold 16 at a time on a magnetic base with, of course, the non-magnetic bearing face downwards. There were quite a few incidences of thrust washers flying through the air when I tried to take too much off in one pass!
David.
With STD thrust washers, the end float is within spec at 0.008\", but fitting +5 thrust washers will bring it right out of spec at 0.003\", i.e. half the minimum specified float.
The 0.006 - 0.008\" limits were specified for a reason and 0.003\" is far too little in my view. I would keep to STD size or, as Alec said, get some +5 washers ground down to +2 if you want to take the end float to the allowable minimum.
I assume the tight limits on the 2.5 are to avoid the crankshaft hitting the block due to the longer crank throw and the 25% heavier clutch end loading. I\'d be surprised if there is a great risk of the thrust washers falling out on the 2.5 engine until beyond the 2000 maximum of 0.014\" end float, but perhaps someone will know different.
Incidentally, one of my jobs as an apprentice 45 years ago was to grind thousands of +0.003\" thrust washers to STD because our supplier had run out of STD washers for our diesel engine production line. I had to hold 16 at a time on a magnetic base with, of course, the non-magnetic bearing face downwards. There were quite a few incidences of thrust washers flying through the air when I tried to take too much off in one pass!
David.
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Brian
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Hello!
Thanks for the replies. I think I will stick with the 8 thou end float and see how it goes. I would be reluctant to tighten up too much as I don\'t know how much expansion takes place. I also asked Chris Witor what he thought yesterday and he advised me to leave it at 8 thou too. Thanks for the advice, it has certainly put my mind at rest!
Thanks for the replies. I think I will stick with the 8 thou end float and see how it goes. I would be reluctant to tighten up too much as I don\'t know how much expansion takes place. I also asked Chris Witor what he thought yesterday and he advised me to leave it at 8 thou too. Thanks for the advice, it has certainly put my mind at rest!
