UKPaul

I was going to fit a Cloyes double roller timing chain but, on pulling the Timing cover off, I found that I've already got a duplex (double roller) chain in there (as well as about 1/2 tube of that orange gasket goo stuff :mad )!
It has about 1/4" slack side to side & a fair bit of movement in & out. I think that this is too much - am I right?
Also, the crank sprocket has the numbers "HS-289" stamped on it & the cam sprocket just has "YD" stamped on it. Anybody know what make this would be?
TIA
Paul

Paul 75 L82

Timing chain should not have any slack. It needs to be replaced.

john's '81 mouse

Yep, you need to replace with new chain & sprockets. Go with Cloyes "True Double Roller", maybe around $30 to $40.

Don't know about the stampings on your crank and cam sprockets.

burners

I concur, replace the chain. You may have a double row chain but it might not be a double roller. The two rows are obvious but the extra roller is on each pin. You can have double row chains and you can have double row/double roller chains. When they say true roller, they mean double roller.

Racer16k

A quarter inch is normal. When you install a new one it will be tight for about a month maybe less. They all stretch and wear slightly. True roller is the way to go but not worth the extra money unless you are using double or triple valve springs.

Mikes80L48

When the timing chain broke on my dad's Vette we replaced it with Cloyes True Double Roller and we are very satisfied with the results.

bigvette1

A little loose. But ........ know how much time you spent to just get a look, needs to be changed as a matter of course. Good luck.

UKPaul

Thanks for all the input. I use a lot of duplex & triplex (3 row) chains in other applications &, as mentioned, they always loosen off in the 1st few hundred miles. The trick is knowing how much slack is normal & how much is excessive. As pointed out, I'll just buy a new one for peace of mind.
:cheers: