Subject: Re: 850 Engine Rebuild
Author: David J. Otis
Date: Jun 11, 2001, 12:45 PM
Post ID: 1707073754
----- Original Message -----
From: stephen brenton <sbre-@williamstech.com>
To: <Loopfram-@topica.com>
Sent: Monday, June 11, 2001 3:26 PM
Subject: 850 Engine Rebuild
============================================================Yes, oil pump, sprockets and chain
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I'm rebuilding the engine that came with my 1972 basket case. i
actually got 2 engines with the package, one engine has numbers that
match the frame so i'll use that case. However the crankshaft, pistons,
cylinders from that engine don't look so good. The other engine has
good components, but it has the chain driven camshaft. (The original
engine was gear drive.)
Questions: (1) Are there any parts from the chain driven engine that
cannot be substituted into a gear driven block?
(2) Is gear driven cam
preferred over chain drive?I personnally prefere the gear drive, you won't have to adjust or replace
your chain ever.
(3) The oil pumps are different, the
original engine has straight cut gears the chain driven engine hasIf you look at the chain drive oil pump it has two locating pins that go
helical cut gears, and the driving gear of the oil pump is supported by
2 needle bearings.
into the block, the gear drive pump does not have the pins, the pumps are
not interchanchangeable, the cams are the same. You can use the gear driven
block, the oil pump and gears that came with it and all of the other parts
are interchangeable.
Whats up here?
Thanks for any insight, I'm a rookie in the MotoGuzzi department.