MGB: This is gonna be expensive...

Just pulled these heads from the B...NOT!

Just to give you an idea of the size of these badboys!

Craziest-looking B motor I've ever seen.........what is that from and what kind of modifications are you doing down there?

I do like the 4 valves/cylinder. Very modern!

Yep, that's definitely broke! Construction equipment? Ship?

What is that, a Cummins or Cat diesel?

10 minute break in on a diesel generator motor. Not sure what happened, still under investigation. Each head a seperate unit. Definitily something gone amiss. These things cost more than my house.

Looks like the valves seized in the down position for some reason and the piston smashed them off.

12 cylinder, happened on several cylinders but not all. Just had a top end job.

B..seein ya Wrote:

Quote: "
12 cylinder, happened on several cylinders but not all. Just had a top end job.
"

Which probably means someone did something wrong - correct?

Looks to me like the valve guides were too tight and the valves seized in the down position.

Looks sort of like one of those German Duetz ( spelling? ) engines that they put in big Italian yachts. Tremendous power!!! Two can sling an eighty foot yacht up to about sixty miles and hour. Can't remember the site that I saw one in, but I do recall that the performance was positively breathtaking. Cost? Probably more than I will make in my lifetime.

Jack

The Wiz Wrote:

Quote: "
B..seein ya Wrote:Quote:
Which probably means someone did something wrong - correct?
"

Investigation is on to see what happened and more importantly who will pay :) Some think the time gear loosened, I can't see that effecting just some and not all the valves. Ran fine for the 1st 10 min period, then a shutdown and restart, 5 min in clankity, clankity, clank, crap, shut down, shut down!!!
My first thought was valve stem or roller rocker.

oh hell, just put in a new gasket, and bolt her up....she'll be fine...

As thin as this may sound, could the valves that were installed (they appear to be new) have been of questionable manufacture or the wrong application? Was any work done to the injector pump housing? Looks like there was considerable heat build up to have galled the surfaces like that.

Voting for injector timing here. Were any of the 'rack' setting 'adjusted'????
Precombustion is a destructive dawg!
Or non-OEM parts; there is a big difference sometimes; sometimes not.

Aint that a bitch

I say put it back together, fire it up, pour a can of Bon Ami down the intake and go to some fifty weight with a big dose of STP.

Then put an ad in a paper in another state and sell the darned thing!

Jack

twigworker Wrote:

Quote: "
I say put it back together, fire it up, pour a can of Bon Ami down the intake and go to some fifty weight with a big dose of STP.
Then put an ad in a paper in another state and sell the darned thing!
Jack
"

Hmmm ... Saved - to Hot Tips

twigworker Wrote:

Quote: "
I say put it back together, fire it up, pour a can of Bon Ami down the intake and go to some fifty weight with a big dose of STP.
Then put an ad in a paper in another state and sell the darned thing!
Jack
"

Ad could read " Fresh top end, runs good, may need a tune-up"

Seafoam. Yeah, that'll fix it.

I've always found that 90 weight oil mixed with some sawdust is very good at masking knocks and clanks. :)

I have just revised my thoughts on ever buying a car from a board member:->

Pete