Had to remove 787 heads to get nut out of top of cylinder

[JOHNFLAGG]

Motor was not running,I had rave valves out and spark plugs out,checking the clearance for new rave valves,In the process i was doing, a small nut dropped and found the opening for the spark plug and dropped into the cylinder,(I couldn't hit the hole if i was aiming for it!!!)I removed the 2 piece head to get nut from the cylinder,My question is ...when i re-assemble the head pieces to the cylinders with new O-rings,What type of sealant should i use...Looks like the last owner used a bunch of clear sealant on all the surfaces,thanks guys,787 motor

 

[switt]

There are rubber seals, no sealant.

 

[JOHNFLAGG]

Ok thank you was wondering because sealant was on them when i disassembled...

 

[mikidymac]

Actually the black o-rings around the cylinders get Loctite 518 per the manual. The large head shell ones go on dry as well as the orange spark plug o-rings.

 

[mikidymac]

There are rubber seals, no sealant.

That is not correct, see post above.

 

[switt]

It looks like I stand corrected. However, my 2 787's in my challenger 1800 do not leak with rubber seals only.

 

[mikidymac]

It looks like I stand corrected. However, my 2 787's in my challenger 1800 do not leak with rubber seals only.

They probably will not leak but the correct way to do it is with the sealant.