My 603.970 is making that classic “rattle-rattle” at startup and at idle. The noise goes away with increased RPM but I feel it’s time to replace some timing chain parts A couple questions relating to the replacement of those parts:

Can all the timing chain related parts be replaced with only the removal of the tensioner and the valve cover?

If the current timing chain has no master link, can I assume it’s from the factory?

What is it about the tensioner…does it loose its ability to hold oil pressure and thereby loose pressure to the chain rail?

Visually, the chain, cam sprocket and rails look fresh and I’m planning to hand rotate the engine to #1 TDC to check for stretch. If within limits, unless strongly advised otherwise, I plan to replace the tensioner only.

I’ve read quite a few threads re: this subject and they have me pretty well spooked enough to take the car off the road until I address this issue.

Mav

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'91 350SDL 165K miles
Lovin' her until she blows...
'01 Dodge Ram Cummins 4X4 DWR
Stump pullin' beast...