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It is very rare to have a crank with undersize journals. But if they
look good, they probably are good. Get it miked and see what it says.
I would not get it polished or ground unless you absolutely have to.
Undersize bearings can be gotten but they are hard to find for the
B30. Fortunately they are a lot easier to find for the B20 and are
indeed the same bearings. If you have two each that can be saved and
reused, you are in good shape. In fact I would plastigage it first and
see if you need any bearings. It may be that your old bearings are good.
But if not, and you can't find B30 bearings look for B20 (or B18) bearings.
Among other things they are enough cheaper that you can probably almost buy
two sets as cheap as one set of B30s.
These bearings show up on ebay rather frequently, by the way.
I think what you found was steel cam gears, not a steel cam. The steel
gears were first used in marine engines which drove a water pump off the
front of the timing cover. I believe that they were stock in some of the
later B30s but can be used in any of the B18/B20/B30 engines and are preferred,
because the fiber gears tend to wipe out. In my experience they usually come
loose from the steel hub but occasionally they also completely go to pieces.
The steel cam gears come as a pair and are not compatible with the crank gear
for the fiber cam gear- you have to replace both gears because they are of
a different pitch.
By all means keep the steel gears. You should examine the cam closely,
because those engines are notorious for the lifters wiping out the cam.
I have wiped out several cams. The OEM cam for the B30 in the US is the "C"
cam but you can get other cams from KGTrimning in Sweden. If you have to
replace your cam you should get a "D" or "K" cam, which will give you a little
bit better performance. You should also go to IPD lifters and pushrods.
(I would recommend an IPD cam also but they have quit handling B30 cams.)
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma
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