..My engine's knocking noise...here we go again..

Hi everyone!
Well, after few weeks of thinking about my engine issues I have decided to drop it and strip it down...this morning
To be honest I was expecting some horrors but hmm..here is what I found...






Well, need to add all the bearings/cam were new... I know it looks like it was running hot but could this cause all those bearings wear? please tell me your thoughts, suggestions?

Cheers
arek

 

What engine?

I'll guess T4 so maybe @Paul Weeding knows but I believe he is having 2 weeks holiday so maybe @zed knows?

 

Remind me what you did when you rebuilt it the first time round!!

Crank reground??

 

No. It was very budget rebuild if you know what I mean ;-) The crank itself doesnt look bad really I only replaced main/cam bearings and camshaft/pushrods.. It looks like at the mo I was right suspecting rods/pins coz they seem to be worst/quite badly worn..it also looks like its been overheated whic

 

That cam is in a bad way if it's new, what mileage was on it? My guess is you had a failed oil pump, blocked galleries, ran it with no oil, or the bearings you installed were the wrong size. Did you install new lifters with the cam and break it in then run it in?

The heating on the bearings makes it look like it was elliptic hence me asking were the bearings the correct size. Out of interests, does it look anywhere on the case bearing saddles like the bearing numbers have been stamped into the case? Could point to a bent crank/worn out case.

 

Sorry guys...its my boody mobile grrr...unfortunately Im struggling to write anything on my comp too
Anyways back to subject... the motor was overheated probably as it was really bad timed (my fault)...
I didn't really measure anything just had a good look/touch that was it... I did realise it was not done properly at the time but was really pushed to get it running asap... The crank still looks ok but I know it needs to checked this time.. Any advice how to do it please and where exactly?

 

Nope..there no stamps of bearing number anywhere onto case... I checked it...in fact this motor has apx 180k kms on it so its not too bad for 35 years old...also pending all its life in Germany it looks like its been properly serviced at the time.. I know its does not mean anything but... The cam was nearly new the lifter brand new from CBs... The fact is also there was a problem with oil pressure when it was cold...

 

Yep..will try to measure everything tomz and will post it up here defo... Got to make sure this time everythings need to be done properly...
BTW.. I remember I measured old mains and they turned out to be standards...I did break the cam in but it was badly timed..

 

Looking at the centre main, it looks like the crank might have a slight bend in it...

Also, it is worth noting that all of the builds that I've had come through, not one has had a crank within its tolerance... so everything is getting a 0.25 grind - That's mains, and rod big ends.

Cases are a real 50/50 as to whether they need a line bore... Most you get are on the edge of tolerance, usually just within, others are just over spec...

Can you confirm the cam was new or used? Did you use new lifters with it if it was used, or lifters that came with the cam?

 

The cam wasnt brand new however it was not used just spent abit of time in my mates shed..the lifters bought brand new from CB Performance in US.. I put them into the block and did break in for 15-20 mins...
BTW lifters still look like new...

 

Yes, the wear pattern looks like the crank was moving in an elliptical pattern, suggests wrong sized bearings, worn case or bent crank.

 

I'd bin the cam and bearings, have the crank checked and ground if needed, looks fubar to me though

 

What's wrong with the cam ? Is this not a case of shot big ends ?

 

The photograph isn’t great but I can’t see anything wrong with the cam, it just looks like it’s had a break in run. Can’t see anything wrong with the main bearing journals either but the crank needs to be inspected and measured properly (a Vernier measurement would indicate if the crank has had a regrind).

In my opinion the bearing damage is probably due to low oil pressure or the wrong size bearings resulting in low oil pressure. The crank could also be a bent - that’s why it needs to be inspected.

 

Hi,
Thanks guys.. Much appreciated for any help Well been busy so didnt have much time for the bus..anyway at first sight looks like there is indeed a bad/wrong/worn? bearings as they are pretty loose on the crank..all of them.. This indicates that I made mistake at measuring the crank/old bearings.. Well learning hard way.. Will check them properly when get the tool I ordered so will let you know.. But yes you right! There was a problem with low oil pressure..the question now is what caused that? Could have been quite few things really... The cam itself well I think too is absolutely fine as the lifters are.. It might be that poor pic.. Anyway big thanks again as at the time I can count on you only