2.7 total rebuild coming will need some help

[IMR-Merlin]

Well boys, the problem was found. The "mechanic" never tightened down the cam sprocket on the right bank, so the nut backed off, the pin popped out and all the valves on that side crashed.

We are leaning toward not splitting the cases. The car has a total of 90k on it and this is a second engine (Porsche warranteed the original).

All the bores look clean with a a good cross hatch pattern and no visible pitting. i will be borrowing bore gauges this week to check for ovaling.

I will be in need of 6 rockers, 3 intake and 3 exhaust valves. What do you think the chances are that the valve guides will be ok after crashing the valves?

Oh and good to meet some of you yesterday.

Brendon

[IMR-Merlin]

Also, just an afterthought. Since this is a *engine, what are the chances it's not a magnesium case?

The casting numbers are 901.101.102.7R

[IMR-Merlin]

blah, disregard my last post... it's a mag case... ugh

[ChrisBennet]

Originally Posted by IMR-Merlin

Well boys, the problem was found. The "mechanic" never tightened down the cam sprocket on the right bank, so the nut backed off, the pin popped out and all the valves on that side crashed.

We are leaning toward not splitting the cases. The car has a total of 90k on it and this is a second engine (Porsche warranteed the original).

All the bores look clean with a a good cross hatch pattern and no visible pitting. i will be borrowing bore gauges this week to check for ovaling.

I will be in need of 6 rockers, 3 intake and 3 exhaust valves. What do you think the chances are that the valve guides will be ok after crashing the valves?

Oh and good to meet some of you yesterday.

Brendon

There is a spec for measuring allowable wear. You lift the valve off the seat a certain amount and see how far it can wiggle. I don't know if that would apply to this situation. Being the conservative guy I am, I would send the heads to Anchor Atlantic and let him go through them. He will also catch the tired exhaust valve springs that the previous engine builder reused, etc.
He's very reasonable, especially as Porsche things go.

[IMR-Merlin]

Thanks Chris, I will look up his information.

[IMR-Merlin]

also, found out the issue on how the car jumped time!!

[IMR-Merlin]

And the build thread on my car

new member 930 project

pictures got dropped, so most are here

https://www.facebook.com/BrendonMcQuaid/media_set?set=a.10203697233409192.1168236990&type=3

[HWgeek]

OUCH! I guess it wasn't torqued correctly!

[IMR-Merlin]

Originally Posted by HWgeek

OUCH! I guess it wasn't torqued correctly!

Nope, not at all!! I borrowed the tool to remover the cam sprocket nut on the Left bank today from Dick and Precision.... it was maybe 20 lb/ft, and that is being very generous.....

[mikedsilva]

wow

[Flat6pac]

There is a spacer missing between the idler and the tensioner to fill the gap.
Bruce