Timing Chain on VP 4.3L

[superpop]

Took the motor out of my boat last week to replace the rear main seal and decided to tear into it a little more since it was already out. Took the front timing chain cover off and discovered that the chain is really loose, like 1/2" of play on one side. I remember somewhere seeing a tensioner kit that you could add, does this provide any benifit and can anyone tell me where I can get this kit if I need it. PN would be helpful. It is a 96 VP 4.3L Vortec Motor. Also, I painted the whole block Volvo red and got a little paint on some of the valve rockers does this paint hurt anything.

 

[Bondo]

Re: Timing Chain on VP 4.3L

Chevy Timing Chains are Replaced when Stretched,......

There's No Tensioner "Kits" for your motor........

 

[bjcsc]

Re: Timing Chain on VP 4.3L

If you are describing the maximum travel, i.e. both back and forth, 1/2" is normal and in spec.. If you mean 1/2" on one side and 1/2" on the other (back and then forth) the chain should be replaced. I am assuming that by "one side" you mean the side not under tension and 1/2" is the total it will move back and forth. If so, you're OK. The Volvo manual states:

"If the camshaft timing chain can be moved back and forth in excess of .625in. (16mm), make a note that the camshaft timing chain should be replaced during reassembly"

The tensioner piece you asked about is a plastic piece that was added at some point. Someone here retrofitted one, but it did not make a difference. I'll try to find the thread and edit this if I do.

Edit: Found it. Here's a pic of it:

It was Newport Dave who did it, in this thread

 

[newport dave]

Re: Timing Chain on VP 4.3L

Yes, as Bjcsc sais, the tensioner and new timing chain set did not repair the problem (noise) on the Volvo 4.3 pictured. I never was able to diagnose the problem.

My engine builder recommended the tensioner based on a GM (not Volvo-Penta) service bulletin. I can't find the bulletin but it had a parts list. As I recall the parts were about $250.00

Dave

 

[Bondo]

Re: Timing Chain on VP 4.3L

Hmmmmmmm,.......... My Bad,....... I Guess............

That's the 1st,+ Only tensioner I've Ever seen on a Chevy...........