2711Re: Water pump - 520i
- Jul 16, 1944On the e28 6 cylinder 2.7L BMW's...
The crank bolt is not a standard item. It is BMW-designed and
employs the bolt and washer as a complete unit. In other words, you
can't buy one at any Nut-&-Bolt supplier.
The hex on the bolt is 22mm. You have two "reasonable" options for
removing it (the 3rd option is plastic explosives or HCl acid, I
Option 1. Use/make a tool that holds the crank while allowing you to
get the bolt out. BMW makes one of these, I suspect. (I also suspect
it requires a substantial investment of cash to acquire.)
Option 2. Use the engine/drivetrain to hold the crank while you
remove the bolt. ASSUMING you have a manual transmission, put the
car in 5th gear (not 1st) and pull up the emergency brakes. It is
possible to break the bolt loose using a cheater bar on the ratchet
handle IF the clutch doesn't slip.
Your other question is the direction of the threads on the bolt. As
I recall, the 22mm bolt on the end of the crank is a right-hand
thread. (It's the large nut holding the radiator fan on that is left
hand. I sometimes get the two mixed up.)
--- In bmwe28@..., Alan Myler - at home <amyler@e...>
> Help please.
> While changing the water pump on my 520i this evening (M20 engine)
> I managed to drop one of its bolts down past the timing belt and
> into the casing surrounding the belt's lower cogs.
> This casing is behind what I guess is the crankshaft pulley.
> To get that bolt out I need to remove that pulley and take off the
> plate that closes off the lower portion of the timing belt housing.
> Apart from considerations such as replacing the pulley in the same
> position afterwards, is this a tough job?
> There appear to be 6 or so 13mm bolts holding the pulley to what I
> premuse is the flywheel. No doubt they'll come off easily enough.
> But here's also the big nut/bolt/whatever that looks like it's
> attached to the end of the crankshaft. Is this torqued to a
> million lb-ft or does it come off easily? Is it a left or right
> hand thread?
> Advice gratefully accepted.
> '87 520i
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