engine and drivetrain Knock Knock... Who's There? Knock Knock.

[Rocan]

Did u pull individual plug wires and start?

 

Will you make an audio file and post it?

 

Am I typing for my own benefit? :-p

I tried that, but the problem is that as soon as the motor spins for a few rotations and pressure builds the sound is gone. I'll try to remember to get an audio file tomorrow morning.

[ray_]

I'll type slowly for you :-)

 

If you pull a wire and then start the car, and the knock is then gone, that would be the offending cylinder. If the sound is not gone, replace the first wire and proceed to the next wire. Rinse, repeat. Therewith you can perhaps isolate the issue. Or not.

 

[Rocan]

sorry ray I read that too quickly, could you write it again? 

 

 

[ray_]

No o o oooo!

 

[FB73tii]

Boy, you guys type way too fast!

 

 I think Federal Mogul has a webpage of bearing pictures.

 

If no-one has posted it in a while here is a great resource on reading rod and main bearings:

 

Engine Bearing failure analysis guide
Clevite 77 Issue
Form # CL77-3-402
www.cleviteonengine.com/publications/CL77-3-402.pdf

Also see the updated Web version with more photos than the pdf version (beta V.3)
http://catalog.mahleclevite.com/bearing/

 

--Fred '69 & '74tii

[Rocan]

Boy, you guys type way too fast!

 

 

If no-one has posted it in a while here is a great resource on reading rod and main bearings:

 

Engine Bearing failure analysis guide

Clevite 77 Issue

Form # CL77-3-402

www.cleviteonengine.com/publications/CL77-3-402.pdf

Also see the updated Web version with more photos than the pdf version (beta V.3)

http://catalog.mahleclevite.com/bearing/

 

--Fred '69 & '74tii

 

Finally, someone with some useful advice

[ray_]

Finally, someone with some useful advice

 

 

A lake! Go jump in it!

[Guest_anonymous]

very nice links Fred. Thank you

[Hans]

More to the point, oil pressure is fine, CR is low, so maybe piston slap on start-up. I'd have thought chain tensioner loss of prime would create rattle as chain hits side of upper cover, not a knock.

[ray_]

More to the point, oil pressure is fine, CR is low, so maybe piston slap on start-up. I'd have thought chain tensioner loss of prime would create rattle as chain hits side of upper cover, not a knock.

If only there were technology for an audio clip.

 

;-)

[Rocan]

lets see if this works... knock is only there for a second, at the 23 second mark.

 

https://www.dropbox.com/s/uozgw693qgnndlq/Memo.m4a

 

 

 

[ray_]

lets see if this works... knock is only there for a second, at the 23 second mark.

 

https://www.dropbox.com/s/uozgw693qgnndlq/Memo.m4a

Holy cow!

[Rocan]

Holy cow!

 

 

See look, I give you what you want and all I get is Bart Simpson. 

 

[FB73tii]

Holy cow!

 

Yeah, this might be a bit more useful......

 

 

Now back to your regularly scheduled FAQ discussion.....