Thread: Over heated engine - NOW WHAT - your advice please

Originally Posted by clubagreenie

The guy oppoite bunning is posibly Wayne Smith, he's a god when it come to pretty much anything a lomg a your pocket are deep and you're not on a time budget. 500cc GP bikes, merlins, pretty much anything.

Where about's this Wayne Smith Clubagreenie?

The guy is at Northmead. I thought he was good value at $110 per bank.and I dropped them to him on Saturday morning and got them back that afternoon. Only thing was they weren't cleaned up but that didn't take me long to do when I got them back home. I reckon he is good value.

Must have caught him on a good day. I've been there with 2 years of research and planing for an engine build and in <30 seconds he can debunk it all and turn around and come up with something better.

Bunnings Nth Parra, on Nth rocks Rd, directly opposite the driveway. Small inconspicuous sign saying Smith Engine Research. The usual, grungy, crap everywhere brilliance.

Today finally got the heads off. Next to the Hawkesbury surrounded by smoke , quite some place to work.
As it was the first time I took Cyl. Heads off I noticed something strange , which perhaps to the more experienced is normal? :
Most bolts came loose very easy. With a normal large bracket ( 350mm ) on the socket it took reasonable force but not as much as I had expected. I'm fairly strong but a light weight ( 1870 mm tall and only 76 kg. ) so expected a real fight with each bolt , not so... except the driver side head where the inner most front and rear bolts took a lot of screaming added to my 59 year old muscles.
I checked flatness of both heads with a new ruler , both sort of hollow in the middle when looked at with the ruler diagonally, I'd say about 0.5 mm at the most. All the cylinder sleeves seem OK , perhaps a micro tad up but only able to feel with finger nail, not visible.
Got the new heads ready , but wonder if I should replace cam shaft ?
Attached a bunch of photos for your's to comment on.
Thanks again:
J.

And some more photos to add to previous post. thx.

Have you cleaned the pistons down? That's a clean cylinder!

As for the cam, if you can't wipe those marks off with your finger, I'd suggest its been real hot! Is your oil pump ok?

I'm not an engineer or an expert though!

Good luck mate!

Suggest you get the heads crack tested and the block hardness tested. That's one of the lessons I've leant from buying 2nd hand engine parts.

Originally Posted by Keithy P38

Have you cleaned the pistons down? That's a clean cylinder!

As for the cam, if you can't wipe those marks off with your finger, I'd suggest its been real hot! Is your oil pump ok?

I'm not an engineer or an expert though!

Good luck mate!

I've seen tons of cams look like that, it's a consequence of the lifter faces going concave with wear. Nothing special, just old age, best replaced.

As for flatness, feeler gauges under a ground edge of a steel straight edge will tell you if the block needs decked. Nice blowout mark into the water jacket! The heads most certainly will need a closer look by a machine shop. The liners that I've seen loosened tend to drop around 1mm, so if yours are all the same then they're probably OK.