S

Stacked it

New Member

• Jul 10, 2012

• #1

All
just put my engine back together and all is well until I take it up to about 2500 rpm. At that speed the engine makes an itermittent rattling sound. It sounds like the tappets go out of adjustment. I have set them now to 10 thou about 6 times and it keeps happening. I don't think its the bottom end but will take the sump off tonight just to have a look at the crank and check the little ends.
The engine runs really sweet and at idle you can not hear anything.
I have replaced the rocker shaft but not the rockers or push rods. Could this be the problem?
Any ideas would be very helpful.

Cheers

 

mad git

New Member

• Jul 10, 2012

• #2

When you have the sump off, check the BIG ends, they seem to be prone to wear. Probably because previous owners over the years don't/didn't change the oil often enough......If there is wear on them, the main bearings are most likely the same..

 

S

Stacked it

New Member

• Jul 10, 2012

• #3

Thanks Mad git

Big ends, mains, little ends, pistons are all new. Crank has been reground and I am pretty confident that all is well down there. I'll have a look anyway. Also the noise is not constant or regular it comes and goes. Its winding me RIGHT up. Just spent bundles on the machining etc... and I don't want to do any damage.

 

jamesmartin

Well-Known Member

• Jul 10, 2012

• #4

crank regrinding can often be poor ,tappet noise is have the speed of crank noise

 

S

Stacked it

New Member

• Jul 10, 2012

• #5

Yep, I'll have a look tonight. I think any issues will manifest themselves as scratches/ scoring.

 

dominicbeesley

Well-Known Member

• Jul 10, 2012

• #6

Timing chain rattling? Is the adjuster spring on and the anti-chatter plates set correct?

Engine knock...recheck timing, does it go away if you retard the timing?

A length of 1"x1" used as a stethoscope can sometimes help but watch out for moving parts, it hurst when the stethoscope turns into a projectile if its stuck in your ear!

 

S

Stacked it

New Member

• Jul 10, 2012

• #7

I thought of the chain too but it seems to be coming from the top of the engine. Chain is also new.