Start up knock - ZR-1 Net Registry Forums

Flyman 27 · 05-07-2019

My '91 has always knocked a little upon startup. It fades away after a couple seconds. This year when I started it the knock was much louder & lasted much longer. Now it is doing the extra loud knock on all start ups.

I have had some experience with overhead cam engines and I would guess the problem to be cam chain slop. Either one or more chain guides are worn or broken.

Has anyone done this repair before? Any idea of cost?

Dan

DRM500RUBYZR-1 · 05-07-2019

Which oil filter do you use?
and, please explain, deep knock or a metallic rattle?
Marty

rush91 · 05-07-2019

My '91 has always had a second or so of rattle, but have noticed it goes away after an oil change. ( Amsoil and AC Delco PF970C ) Once I get around 1000 miles or so on the new oil change, the rattle slowly comes back.....

DRM500RUBYZR-1 · 05-07-2019

Try the Bosch 3401 listed below and please report back if this changes it.

Bosch 3401 Premium FILTECH Oil Filter

by Bosch Automotive

/* * Fix for UDP-1061. Average customer reviews has a small extra line on hover * https://omni-grok.amazon.com/xref/sr...teTemplates#40 */ .noUnderline a:hover { text-decoration: none; } 4.6 out of 5 stars 1,879 customer reviews

Price:$9.32 FREE One-Day

Exclusive FILTECH media technology screens out more harmful contaminants for greater engine protection
Strong steel base plates and housings prevent warpage, leaks, and poor fit
Silicone anti-drainback valve ensures a supply of clean oil when the vehicle is started
High lubricity gasket design provides a tight seal, yet allows for easy removal

› See more product details

Flyman 27 · 05-07-2019

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.

DRM500RUBYZR-1 · 05-07-2019

OK,
Rattle or KNOCK?

Flyman 27 · 05-07-2019

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.

DRM500RUBYZR-1 · 05-07-2019

OK, that does sound like tensioner/ chain noise.
Which oil are you using?

DRM500RUBYZR-1 · 05-07-2019

Quote:

Originally Posted by rush91

My '91 has always had a second or so of rattle, but have noticed it goes away after an oil change. ( Amsoil and AC Delco PF970C ) Once I get around 1000 miles or so on the new oil change, the rattle slowly comes back.....

Change to the Bosch filter now that it is doing it again after 1000 miles.
Just change the filter and let us know what happens.
Marty

Demps · 05-07-2019

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/

05-07-2019	#1
Flyman 27 Join Date: Apr 2017 Location: Wayne Illinois Posts: 400	Start up knock My '91 has always knocked a little upon startup. It fades away after a couple seconds. This year when I started it the knock was much louder & lasted much longer. Now it is doing the extra loud knock on all start ups. I have had some experience with overhead cam engines and I would guess the problem to be cam chain slop. Either one or more chain guides are worn or broken. Has anyone done this repair before? Any idea of cost? Dan __________________ [SIGPIC][/SIGPIC] 91-#1935 Black/black & gray, Haibeck 500 Cams by Pete

05-07-2019	#2
DRM500RUBYZR-1 Join Date: Sep 2008 Location: Mullica Hill, NJ Posts: 2,630	Re: Start up knock Which oil filter do you use? and, please explain, deep knock or a metallic rattle? Marty Last edited by DRM500RUBYZR-1; 05-07-2019 at 03:49 PM.

05-07-2019	#3
rush91 Join Date: Feb 2016 Location: Carterville Illinois Posts: 854	Re: Start up knock My '91 has always had a second or so of rattle, but have noticed it goes away after an oil change. ( Amsoil and AC Delco PF970C ) Once I get around 1000 miles or so on the new oil change, the rattle slowly comes back.....

05-07-2019	#5
Flyman 27 Join Date: Apr 2017 Location: Wayne Illinois Posts: 400	Re: Start up knock 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. __________________ [SIGPIC][/SIGPIC] 91-#1935 Black/black & gray, Haibeck 500 Cams by Pete

05-07-2019	#6
DRM500RUBYZR-1 Join Date: Sep 2008 Location: Mullica Hill, NJ Posts: 2,630	Re: Start up knock OK, Rattle or KNOCK?

05-07-2019	#4
DRM500RUBYZR-1 Join Date: Sep 2008 Location: Mullica Hill, NJ Posts: 2,630	Re: Start up knock Try the Bosch 3401 listed below and please report back if this changes it. Bosch 3401 Premium FILTECH Oil Filter by Bosch Automotive /* * Fix for UDP-1061. Average customer reviews has a small extra line on hover * https://omni-grok.amazon.com/xref/sr...teTemplates#40 / .noUnderline a:hover { text-decoration: none; } 4.6 out of 5 stars* 1,879 customer reviews Price:$9.32 FREE One-Day Exclusive FILTECH media technology screens out more harmful contaminants for greater engine protection Strong steel base plates and housings prevent warpage, leaks, and poor fit Silicone anti-drainback valve ensures a supply of clean oil when the vehicle is started High lubricity gasket design provides a tight seal, yet allows for easy removal › See more product details

05-07-2019	#7
Flyman 27 Join Date: Apr 2017 Location: Wayne Illinois Posts: 400	Re: Start up knock 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. __________________ [SIGPIC][/SIGPIC] 91-#1935 Black/black & gray, Haibeck 500 Cams by Pete

05-07-2019	#8
DRM500RUBYZR-1 Join Date: Sep 2008 Location: Mullica Hill, NJ Posts: 2,630	Re: Start up knock OK, that does sound like tensioner/ chain noise. Which oil are you using?

05-07-2019	#10
Demps Join Date: Jan 2006 Location: Niceville Posts: 1,000	Re: Start up knock 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/