Another Guy With Force 120 Issue

[Popeye_1990]

Thanks. Had champions before could not find them around here.

Right now only in freshwater. Get things straightened out wanna hit inland new here.
Was curious if blown head gasket could be at root of #4 heating up so much than others. Gonna pull exhaust cover and see if debris is issue. If not...will go into head.
Do buzzers fail?

Will check compressing as well.

 

[Popeye_1990]

Yes. I wiped them all except number 1. I cannot read this style plug without the electrode and tip. Gonna attack exhaust cover next.

Will post pics hopefully tomorrow. Look for post. Thanks

 

[puffitu]

Anything can fail if not maintained. When I got my boat w/120 hp force on it. It didn’t have a buzzer; I ended up putting an after market buzzer and a warning light on it for good measure and the whole wiring was a mess, blown head gasket and everything else had to be gone through because when you notice a pattern of neglect you tend to wanna get the thing to a reasonable point of reliability, but anyway I’d pull the thermo cover and see what’s up first then move on to the exhaust/water jacket and or head gasket. But I’d also make sure the fuel mix screws were adjusted correctly on both carbs. Did you check compression? Get NGK plugs-they are great

 

[Popeye_1990]

Anything can fail if not maintained. When I got my boat w/120 hp force on it. It didn’t have a buzzer; I ended up putting an after market buzzer and a warning light on it for good measure and the whole wiring was a mess, blown head gasket and everything else had to be gone through because when you notice a pattern of neglect you tend to wanna get the thing to a reasonable point of reliability, but anyway I’d pull the thermo cover and see what’s up first then move on to the exhaust/water jacket and or head gasket. But I’d also make sure the fuel mix screws were adjusted correctly on both carbs. Did you check compression? Get NGK plugs-they are great

Ok got stuff pull. Got excited and for the compression check. Will do when reassemble.
Will send these in short post.

Front of head where I believe water circulates underneath cover. Very clean no debris.

 

[Popeye_1990]

Anything can fail if not maintained. When I got my boat w/120 hp force on it. It didn’t have a buzzer; I ended up putting an after market buzzer and a warning light on it for good measure and the whole wiring was a mess, blown head gasket and everything else had to be gone through because when you notice a pattern of neglect you tend to wanna get the thing to a reasonable point of reliability, but anyway I’d pull the thermo cover and see what’s up first then move on to the exhaust/water jacket and or head gasket. But I’d also make sure the fuel mix screws were adjusted correctly on both carbs. Did you check compression? Get NGK plugs-they are great

Ok got stuff pull. Got excited and for the compression check. Will do when reassemble.
Will send these in short post.
View attachment 349711
Front of head where I believe water circulates underneath cover. Very clean no debris.

 

[Popeye_1990]

Other side of head facing block. Looks good. No breaks, tears, holes in gasket. In fact, the gasket all but fell out when head removed. Hmmm

 

[Popeye_1990]

View attachment 349715
Other side of head facing block. Looks good. No breaks, tears, holes in gasket. In fact, the gasket all but fell out when head removed. Hmmm

Back of cover and front of head...there was no gasket between them, just sealant. Should there be a gasket?

 

[puffitu]

The gasket will tell you if there was a leak

 

[Popeye_1990]

View attachment 349716View attachment 349716
Back of cover and front of head...there was no gasket between them, just sealant. Should there be a gasket?

All the bolts that came out from cover holding head on looked like the one on the right. Its dry. The one on the left came out wet from the bottom left side at plug #4 Where heat issue is...is this a clue?

 

[Popeye_1990]

All the bolts that came out from cover holding head on looked like the one on the right. Its dry. The one on the left came out wet from the bottom left side at plug #4 Where heat issue is...is this a clue?View attachment 349717

Inside cylinders..

 

[puffitu]

 

[puffitu]

The head was most likely not torqued down correctly.

 

[puffitu]

120in.lbs

 

[Popeye_1990]

The head was most likely not torqued down correctly.

Seemed awful easy to get off compared to other things I've worked on. And no damage to gasket...falling out really shocked me.
Yes....i can see dark fluid on the gasket ring just above where the wet bolts was.

 

[puffitu]

You’ll need a gasket or you may be able to re use the old (I wouldn’t). These engines are easy to work on, parts are getting scared but still out there for the most part. Fuel mixture screws are very important though

 

[Popeye_1990]

Maybe running lean on number4?

Ias....i sent of pics and stuff. Like to see what you think if you get a chance

 

[Popeye_1990]

You’ll need a gasket or you may be able to re use the old (I wouldn’t). These engines are easy to work on, parts are getting scared but still out there for the most part. Fuel mixture screws are very important thoughView attachment 349727

Wow thanks Puffitu. That's a huge help. Any idea where to shop online?

 

[Popeye_1990]

You’ll need a gasket or you may be able to re use the old (I wouldn’t). These engines are easy to work on, parts are getting scared but still out there for the most part. Fuel mixture screws are very important thoughView attachment 349727

Also...should there be a gasket between the cover and head?

 

[puffitu]

Also...should there be a gasket between the cover and head?

Look at the diagram I posted in this thread

 

[puffitu]

Wow thanks Puffitu. That's a huge help. Any idea where to shop online?

Depending on the engine I’m working on; I typically go to marine engine dot com, dial in to the model then go through their diagrams and part numbers then either buy from them or eBay-depends on $$