What are some considerations during timing chain replacement?
While the Manual is usually good in describing how to do things in this
case it is poor and not even accurate ,as it says you have to remove the
oil pan and you don't have to, in fact you can't remove the pan! Every
thing can be done from the front-at least in my case as I have already
removed the large round metal and rubber spacer between the radiator and
the fan (not the fiberglass part attached to the rad.) This gave enough
room to work and get your head up in there to be sure that you get the
timing marks in the right place. It is a bit tricky as the new chain goes
in with absolutely no slack. I learned from the experience of pressing the
chain on and found that I was one cog off, so had to pull it off
again.Take
your time and eye ball it to be sure you get the marks lined up correctly.
When draining antifreeze have back end of coach high and after draining by
lowering back end you might save some of the antifreeze from draining
foreword from the block. The engine will have to be supported with a jack
after the front motor mount is removed. (Charles Brousson 5-8-99)
Install a cam button to prevent the cam drifting back and forth within it's
bearings. Mondello has them. Be sure to order the one specifically for
use if the cam is already installed or if it's a new cam installation. (Tom
Warner)
What are the part numbers for prefferred timing chain and sprockets?
Everyone one I have ever talked to(including Joe Mondello) says that the
Cloyes double roller chain and heat treated sprockets are the best on the
market. Best price I have found for them is at Summit, part # CLO-9-3113
for $78.95, or from Mondello part # TR252 for $89. Nice thing about the
cloyes double roller chain and sprocket is that it has three positions for
timing it either standard or 4 dgrees retarded or advanced. Mondello even
sells a CB-15 off set cam bushing for perfect degreeing.
A word of caution when replacing the timing chain and sprockets. If you
have a rebuilt engine and the rebuilder honed the main bearing saddles, you
may need an undersized timing chain. I don't know if under size timing
chains are marked or not. In fact never knew there was such a thing until
I read Mondellos technical book. The only way to tell positively is to
measure between the front cam bearing and the front main bearing housing
bore, it should be 2.424" with the cam bearing in place. If its less you
need an under size chain. Mondello has them. They could also probably tell
you how to be certain what you need. I would and am going to also install
Mondellos camshaft thrust button and bolt to eliminate camshaft walk and
wear of the timing chain and reduces timing problems. It is part # TB745
and is $18. Be sure if you order it you tell them that the cam is still in
the engine. (Tom Warner)
>Hello,
>
>I am new to this mail list, so forgive me if this is a topic that was
>recently covered. The time has come to tackle the task of timing belt
>replacement on my 75 Palm Beach, with a 455.
>
>Can any one offer any good tips for making this job easier? I have removed
>much of the clutter in front of the engine (between engine and radiator).
>
>Any and all insight would be appreciated.
>
>thanks, Tony
>
