Problem? Piston Hit By Valve

[JamesL]

No problem here....

[georgem]

James,

Was the engine making much noise - it looks like the valve was just "kissing" the piston.

[Benz Dr.]

This will happen when the valves are out of time with the pistons. One tooth out will cause the valves to hit heavily and you can hear it happening. This almost looks like a different problem where the head has been milled too much or you had a lot of carbon on the pistons.


 Or, it was out of time.

[stickandrudderman]

I'll bet the head has been skimmed too often.

[JamesL]

Prizes to all!

Head skimmed in a previous life but it had been done half way up a mountain and thus I had less head at #5 and 6 than at #1. The oil problem and this "kissing" resulting.

I'd been told the engine had never been restored. (by the salesman!). That may be the case but whoever opened it, skimmed it and retorqued everything too much must have done something while he was in there!

[ja17]

Hello James,

Measuring the head will give you the information you need.

[stickandrudderman]

On the plus side James your combustion looks good!

[JamesL]

Every cloud

[jameshoward]

Normally you wait until a week or so before a big European Event to start to pull your car apart. Why so early this time? 

(Not that I can talk; progress has actually been negative rather than simply slow...)

[JamesL]

James

That "pulling the engine apart" is the same pulling apart from the last event

I've just finished running it in/doing the oil change and re-torque in advance of next month.  Naj put me in touch with a new head. Here's the parts list/main activity...


Rebore 6 cylinders.
Re-grind crankshaft.   
Blast con rods, resize big ends.   
Fit small end bushes.   
Surface grind cylinder block.
De-grease and blast cylinder head (customer supplied)
Pressure test head.
Fit 12 valve guides
Surface grind cylinder head.
Re-face 6 inlet valves
Supply 6 exhaust valves.
Remove rocker pedestals from head, re-tap threads.   
Rocker ball x 12.   
Rocker arms x 12.
Con rod bearings set
6 Pistons
6 Small end bushes
12 Con rod bolts
12 Con rod nuts
6 Valve guides
6 Valve guides
6 Flange belts
Roller chain
Cylinder head gaskets
Crankcase gaskets
Repair kit
Sliding rail
2 Sliding rails
Engine bay cleaner
12 Litres engine oil
2 Engine oil filters
Fuel filter & ‘O’ ring
4 Litres TQF
3 Litres anti-freeze
Throttle linkage ball
123 Distributor
Coil
.....

[Paul & Dolly]

Hi James,

A trip to Europe is perfect to run in it all in,

Did you do any of the rebuild yourself ?

Enjoy

Paul