1974 Johnson 50 hp 50ESL74M Question

[banchigu]

Hello fellows, what would be the sequence and foot pounds for the cylinder head screws?

Also the two bottom screws are broken in the engine block and I am having a heck of a time getting them out, they broke off years ago. It ran like this for quite some time without me knowing and eventually the gasket blew. I know this may sound stupid but I will ask anyway, if I cannot get them out can I still run it with eight instead of 10 bolts on the cylinder head?

A million thanks in advance.

 

[Keyboardman]

I'm waiting for my factory service guide to come in the mail. Should be here Monday. I'll look for that for you when I get it. I have the same engine.

 

[F_R]

I think you sort of answered your own question. Running it with the missing bolts caused the gasket to blow, right?

 

[gm280]

I would take however much time and effort it takes to remove the two broken bolts. Then chase the treads with a tap and clean the surfaces up and install a new head gasket and install all 10 bolts and torque to sequence pattern. What that pattern is I don't know. But other should be able to supply that info. JMHO!

 

[Keyboardman]

Factory service manual says 14 to 16 ft lbs and then re torque to 16 to 18 after running engine to operating temp and then cooled down to comfortable temp to the touch. I will have to wait until I can scan the pic of the sequence as I'm traveling today will be home on Wednesday. But basically you start with the right hand middle bolt, then the left hand middle bolt followed by the one above that then the one to the right. You keep going in a spiral until you end up at the far most bottom bolt on the left. Tighten all the bolts in this sequence in three increments until up to the initial 14 to 16 ft lbs. Hope this helps. I too would do all I could to try to get the broken bolts out. Try an EZ out.

 

[racerone]

It may not be easy to work on these broken bolts .---Remove the powerhead and it should be much easier !----Making a drill guide would help too.---Easy outs are to be avoided as when they break you have a problem.

 

[oldboat1]

Not a fan of EZ outs either. Have broken one off, as R. says, but usually find they just don't quite do the job. They always look good to me, but think when you really need them (busted, rusted, really messed up), they don't get it. I'm thinking that for head cover bolts, a guy could drill and tap for a larger bolt -- should work as long as the torque value is the same as the others, tightening regimen followed, head properly prepped(??)