Re: Waterpump 1984 E350
> "Whitelightning" <email@example.com> wrote in message
>>"ladeeda" <firstname.lastname@example.org> wrote in message
>>>I am trying to change a waterpump in a 1984 E350.
>>>It seems the threads need to be rethreaded on the two boltholes that
>>>into the engine block.
>>>The bolts go through the timing chain cover.
>>>The timing chain cover has to be removed right?
>>>So the crankshaft pulley damper has to be removed with a gearpuller
>>>So i will need to drill with a 21/64 inch bit and then tap into the
>>>and then rethread and then I will need to put the damper back on
>>>80 pound torque right?
>>>I will then need to reseal the timing chain gasket cover and
>>>the oil pan.
>>>OK seems easy enough.
>>If your going to remove all that you might as well replace the chain
>>and gear as well.
>>And install a sleeve on the damper, by know there is a groove wore in
>>it. sleeve is $5.
> Engine was rebuilt maybe 20,000 miles ago.
> How can I tell if the timing chain was replaced?
At 20K the chain and gears "should" be ok, as in nearly like new. There is a spec
for timing chain deflection but I don't know it offhand. With the timing cover off,
turn the crankshaft clockwise a bit (1/4 turn) to take up the slack. Grab the chain
between the gears to your left as you are looking at the motor. Move the chain side to
side. If more than about 1/8" of motion you will want to consider replacing it. More
than 1/4", replace it for sure. If the cam gear is all steel and the timing set is
that new, it's probably a non issue.
What happened to the threads? You're right about removing the timing cover, but how
did they get damaged in the first place. Those covers (assuming a 5.8L\351 engine)
develop corrosion in the through holes for 4 of the WP bolts. The corrosion spreads
and causes internal and external water leaks. If the assembler didn't clean the holes
or replace the cover you may have the problems occur again when you try to assemble
it. IIRC, the same thing hapens to the 460 timing covers, I'm not all that familiar
with them. On the small block Fords (302\351) it's common to replace an OEM timing
cover due to corrosion in the water pump bolt area when rebuilding. You may want to
consider a new timing cover if it wasn't done on your 20K rebuild. It could save
problems down the road.