s650g compression test

[goodguy34]

I have a Early s650 g gas powered tractor.The compression in the front and rear cylinders are at 145 like they should be.The center cylinders are at about 45 lbs.Has anyone ran into a similar problem?Are these engines known to blow head gaskets or get stuck valves?Just curious what to look for before i tear into it.

 

[PILOON]

In another post you stated that it blew blue smoke so your answer is probably rings, especially since the middle cyls are low compression.
Naturally it might also be valve guides that are worn.
Either way you need to pull the head and with luck it might be only a valve job and gasket set. Bad compression could be valves and oil consumption might only be valve seals.
No way of knowing'til you pull the head.
If you are lucky I believe the engine will prove to be an engine that was used in early ford ranger PU's.
Do a lot of background search on this forum and you should find the cross referances to the engine.
I do recall seeing referances to all the ignition components available from auto parts suppliers.

Good luck!

 

[goodguy34]

I am going now to pull the head-i will post what i find and take pics.Hopefully for the customer,it's minor-he has been warned about part prices.

 

[goodguy34]

Sometime even a blind squirrel gets a nut!I pull the valve cover off this thing,crank it,and the 2 middle cylinder rockers aren't moving-Why?The pushrods somehow were either not put under the rocker arms,or they came out.But the valves are all in adjustment.I put it back together,turn it over and it runs like a beast-The guy bought it running on 2 cylindersfor 2,000 with a rototiller and front loader!Not bad.By the way,does someone know which motor this is by looking at it?