Start up knock

[Flyman 27]

I use Mobil 1 oil

[Flyman 27]

That tensioner from Jerry's looks promising. How much work is required to replace it? My back won't allow me to do much now-a-days, so I would have to pay to have it replaced.

[Demps]

Originally Posted by Flyman 27

That tensioner from Jerry's looks promising. How much work is required to replace it? My back won't allow me to do much now-a-days, so I would have to pay to have it replaced.

It’s sporty for a bad back.

Assuming it’s only/mostly oil pressure related: I’d wait on the oil filter. It’ll cure some. One of my cars (non-Dunn) has the tensioner upgrade & good filter but still rattles some until oil pressure builds.

Ted

[Flyman 27]

I'm not far from Mark Haibeck.

[Demps]

Originally Posted by Flyman 27

I'm not far from Mark Haibeck.

That’ll cure it all.

I would start simple and see if a good oil filter helps...then go from there.
Ted

[Flyman 27]

Originally Posted by Demps

That’ll cure it all.

I would start simple and see if a good oil filter helps...then go from there.
Ted

I have a short video of a startup, but I can't figure out how to post it.

[Ccmano]

Originally Posted by Flyman 27

I have a short video of a startup, but I can't figure out how to post it.

Post it on YouTube then post a link here. Personally I wouldn’t be too worried about a little startup chain rattle. As already stated get a good filter, WIX 51324 is excellent and use 10-40 oil.

Mark Haibeck does an excellent job of explaining the situation.
http://www.zr1specialist.com/HAT%20W...e%20Rattle.pdf

H

[Flyman 27]

Originally Posted by Demps

If isolated to chain rattle at start up and if still somewhat present after new anti-drainback oil filter...this helps some:

https://www.jerrysgaskets.com/housin...ign-90-95-1g4/

That new & improved tensioner from Jerry's is only $160. Mark just told me that he has a process worked out so that it only takes an hour to swap out the old tensioner! Now, that's a plan!

[spork2367]

Originally Posted by Flyman 27

I use the WIX 51324, the HD filter with the silicone anti-drainback valve. They are supposed to be one of the highest rated filters for this engine.

The WIX is one of the best filter options out there. Here is my post from 2013 when I tested it.

Originally Posted by spork2367

Before I saw that Mark had an update including the napa filter, I performed his test on mine. Mine held 11 oz after 8 hours 8 oz. (weight) of oil after 24 hours, consistent with what he found.

I've used napa gold filters on all my other vehicles for years. Wix (manufacturer) makes great filters.

http://www.zr1specialist.com/HAT%20W...ate%202011.pdf

"Oil Filter Recommendation Update 2011
Recently we have observed that the anti-drain back valve in the Bosch 3401 filter is leaking. The filter looses most of the oil after the engine is off for 24 hours. This causes an approximately one second delay before the oil pressure builds at startup. This can add to the time that the right side camshaft chain rattle occurs. My current recommendation is for the ACDelco PF970C filter. We have found that it retains eight ounces of oil after the engine is off for 24 hours. Although the part number has a “C” in it like the original ZR-1 filter the color of the filter is blue. We also found that the NAPA 1324 filter retains eight ounces of oil after the engine is off for 24 hours. The filter is white in color and is made by WIX."


Marc also had an update about some Bosch filters leaking down:

http://www.zr1specialist.com/HAT%20W...ate%202015.pdf

[Paul Workman]

Originally Posted by Flyman 27

Years ago I had a Lincoln with a 4.6L DOHC engine. It had a failed chain tensioner and the chain slapped against the housing upon startup.
What I am experiencing sounds like just like that.

I ordered the oil filter. It's worth a try.

Expertise: I suggest you buzz over to Marc's shop or Pete's shop. Let either of them listen to it and diagnose it...is what I have done once or twice.