think my engine blew up today

[H20doctor]

I will start a new thread as soon as I start the operation, in a week or 2 ..

[freetheoranges]

True.

 

 

Worth pulling valve cover off and cranking the engine. Look for a valve that is not closing all the way. Seat out.

 

 

Wouldn't that like, (for serious) make a mess?

[thread hijack] stethoscope is awesome! however limited to just audio. [/thread hijack]

[datzenmike]

At the least the seat would hang up the valve and it won't close properly. Revved long enough the seat might break, dropping pieces down the bore. The piston would slice and dice it into the soft aluminum head. The valve might snap off and punch through the piston....

[freetheoranges]

Thanks for fueling my nightmares.

[H20doctor]

well today i found the reasons for the knocking noise....drumroll please ...... i threw a 18 mm socket on the cam timing sproket put the bolt in and rotated the cam... exhaust valve on cylinder 4... no close ... stuck... siezed... going nowhere....  #4 piston has a tiny chomp in it, not a smiley chomp or a crescent moon shape, small indent mark... So there Ya have it winner winner chicken dinner , stuck valve   

[TENDRIL]

spit on it

[datzenmike]

Valves rarely seize. The valve may be bent from scuffing the piston and not seating. Did you look at the seat? Is it in place?

[H20doctor]

The seat is fine and in tact... so I would have to tear down the head, and remove the cam to see why its stuck in there ?

[datzenmike]

No, the valve can be removed without that. You will need enough space to compress the spring and remove the keepers. You may have to lightly tap the valve down onto the seat to do this, then drive the valve out of the guide.

[H20doctor]

yes that requires a valve spring tool and I don't have one... ; )