Oh boy, where to begin!!!
Kind of a long post - hope someone can help me.
I have a compression problem on the number 3 cylinder.
Bought the motor (with boat and trailer last year for $500). Seller told me engine ran but needed a tune up. Listened to it run before I bought it (seemed to run okay) and agreed a tune up was probably in order. Being the backyard mechanic that I am, I figured I could probably do most of the work myself.
Thought it would be a good idea to check the compression before I get to far into it. Cylinders 1, 2, 4, 5 and 6 all had 120 lbs of compression, Cylinder 3 - maybe 30 lbs (this was last year). Assumed this could be from a stuck ring. Since a lot of folks thought that Sea Foam may do the trick, I gave it a try. Ran a couple of cans through the tank along with Sea Foam "Deep Creep" through the carbs. No luck - blew out A LOT of smoke but still had the same compression readings.
Just checked it a few days ago, now I have the same 120 lbs of compression in the same 5 cylinders but now have maybe 10 lbs in no. 3 - what gives?
A local marine shop told me to try pouring some Marvel Mystery Oil into the cylinder and let it set for a couple of days. Figured what do I have to loose. Here's where it gets interesting.
I raised/tilted the engine, poured in a couple of ounces into the cylinder just to watch it slowly drip out through the carburator. I thought maybe it was running out back through the intake port and somehow making its way to the carb. Then I thought, this can't be possible since the reed valves should stop this from happening.
Now to turn a long problem into a few short questions:
1) Any other possibilties for low/no compression in Cyl. no 3?
2) Why is the Marvel Mystery Oil draining back through the carburators?
3) Does this motor really have reed valves? (Seloc manual says it has a reed block located at the top of the crankshaft but yet nobody sells reed valves/sets)
Any help/suggestions is truly appreciated.
Thanks
Kind of a long post - hope someone can help me.
I have a compression problem on the number 3 cylinder.
Bought the motor (with boat and trailer last year for $500). Seller told me engine ran but needed a tune up. Listened to it run before I bought it (seemed to run okay) and agreed a tune up was probably in order. Being the backyard mechanic that I am, I figured I could probably do most of the work myself.
Thought it would be a good idea to check the compression before I get to far into it. Cylinders 1, 2, 4, 5 and 6 all had 120 lbs of compression, Cylinder 3 - maybe 30 lbs (this was last year). Assumed this could be from a stuck ring. Since a lot of folks thought that Sea Foam may do the trick, I gave it a try. Ran a couple of cans through the tank along with Sea Foam "Deep Creep" through the carbs. No luck - blew out A LOT of smoke but still had the same compression readings.
Just checked it a few days ago, now I have the same 120 lbs of compression in the same 5 cylinders but now have maybe 10 lbs in no. 3 - what gives?
A local marine shop told me to try pouring some Marvel Mystery Oil into the cylinder and let it set for a couple of days. Figured what do I have to loose. Here's where it gets interesting.
I raised/tilted the engine, poured in a couple of ounces into the cylinder just to watch it slowly drip out through the carburator. I thought maybe it was running out back through the intake port and somehow making its way to the carb. Then I thought, this can't be possible since the reed valves should stop this from happening.
Now to turn a long problem into a few short questions:
1) Any other possibilties for low/no compression in Cyl. no 3?
2) Why is the Marvel Mystery Oil draining back through the carburators?
3) Does this motor really have reed valves? (Seloc manual says it has a reed block located at the top of the crankshaft but yet nobody sells reed valves/sets)
Any help/suggestions is truly appreciated.
Thanks