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[Martin_1962]

If theres no compression on that bank then I would have thought a load of bent valves.Timing slipped?,broken camshaft? :-/

I hope not - they cost enough

[Martin_1962]

Tomorrow I am going to strip (if dry)

Then I will know what is what

But very odd what happened

I was expecting 135 to leak but not 246 to conk out

[cem_devecioglu]

Tomorrow I am going to strip (if dry)

Then I will know what is what

But very odd what happened

I was expecting 135 to leak but not 246 to conk out

tomorrow is another day , go get some rest

[Kevin Wood]

Only thing I can think of is that the timing has slipped (cam has rotated on the sprocket?). Can't remember how the cams are keyed to the sprockets on this engine. There's a dowel between them IIRC? Possible it was left out during the cam swap?

Could the lifters have pumped up so hard that the valves are not closing? Excessive oil pressure perhaps? If so why only one bank?

Slipped cam timing seems the most likely explanation I'm afraid.   

Kevin

[Martin_1962]

Locating pin on cam 3 has snapped

[Martin_1962]

The valves are still sealing

They don't look bent

Will pop out one and check

Looks like I was VERY lucky

Small marks on the piston heads

[TheBoy]

The valves are still sealing

They don't look bent
Will pop out one and check

Looks like I was VERY lucky

Small marks on the piston heads

Wouldn't explain the lack of compression...

[Andy B]

The valves are still sealing

They don't look bent
Will pop out one and check

Looks like I was VERY lucky

Small marks on the piston heads

Wouldn't explain the lack of compression...

If the pin hadn't located between the cam & its pulley then the cam wouldn't have been turning, hence no compression! Obvioulsy depends where the cam had parked itself as to whether there would be bent valves.

[KillerWatt]

The valves are still sealing

They don't look bent

Will pop out one and check

Looks like I was VERY lucky

Small marks on the piston heads

The marks on the crown of the pistons, along with your confirmation of a "noise" means (unfortunately) there was very much definately some contact.

Although the valves may look as though they are still seating properly, the only definitive test you can do (other than removing the actual valves) is to invert the head (balance it so it is flat) and pour a small amount of petrol in to each chamber with all the valves closed.

If the fluid level hasn't dropped after (say) 30 minutes, then you have more than likely got away with it.

Good luck 

[Andy B]

......
Good luck 

Sounds like Martin could do with a bit more help than luck ..... maybe a miracle!        

[Martin_1962]

I removed one valve - no runout

I left petrol in them for about 1/4 hour and no drop

I think they just slipped timing

The cam was turning


May be it was opening 180 out so during power

[Martin_1962]

The valves are still sealing

They don't look bent

Will pop out one and check

Looks like I was VERY lucky

Small marks on the piston heads

The marks on the crown of the pistons, along with your confirmation of a "noise" means (unfortunately) there was very much definately some contact.

Although the valves may look as though they are still seating properly, the only definitive test you can do (other than removing the actual valves) is to invert the head (balance it so it is flat) and pour a small amount of petrol in to each chamber with all the valves closed.

If the fluid level hasn't dropped after (say) 30 minutes, then you have more than likely got away with it.

Good luck 

I think there was about 4 or 5 hits per valve

[Martin_1962]

The valves are still sealing

They don't look bent
Will pop out one and check

Looks like I was VERY lucky

Small marks on the piston heads

Wouldn't explain the lack of compression...

Being 180 out would, I noticed when dismanteling that 3 was ahead of 4

[TheBoy]

The valves are still sealing

They don't look bent

Will pop out one and check

Looks like I was VERY lucky

Small marks on the piston heads

The marks on the crown of the pistons, along with your confirmation of a "noise" means (unfortunately) there was very much definately some contact.

Although the valves may look as though they are still seating properly, the only definitive test you can do (other than removing the actual valves) is to invert the head (balance it so it is flat) and pour a small amount of petrol in to each chamber with all the valves closed.

If the fluid level hasn't dropped after (say) 30 minutes, then you have more than likely got away with it.

Good luck 

As a tip, paraffin tends to work better, as petrol evapourates a bit quicker

[Martin_1962]

Well 15 minutes and it was OK

Just going to seal the cam cover now

May not do much more as I am feeling crap