Yamaha F100 Headgasket

[bamafan]

I am replacing a blown headgasket on my Yamaha F100 - 1999 year. When I removed the old had it appeared to have some type of gasket material sprayed on the head surface. The Clymer manual on these 4-strokes does not mention anything about a gasket material. Should I use something or replace the gasket dry ?

 

[bamafan]

Re: Yamaha F100 Headgasket

^

 

[BRIAN03]

Re: Yamaha F100 Headgasket

I thought fourstrokes dont break. I didnt think the engine covers came off. They never need service. Fourstrokes are the lexis of outboards. I listen to a saleman at a boat show. Told me great stories. Oh ya He said they will last forever too.

 

[bamafan]

Re: Yamaha F100 Headgasket

I heard they only break for the folks in Florida not you guys in Carolinas.<br /><br />Thanks for the help.

 

[jhnboat]

Re: Yamaha F100 Headgasket

bamafan, did you get an answer for your gasket question?<br /><br />Just curious, but how many hours do you have on your F100? Ever have any starting problems after a week or two?<br /><br />jhnboat

 

[bamafan]

Re: Yamaha F100 Headgasket

No help yet. I have had this engine since 1998, I fish almost everyday. Never had anyother issues qith the engine. Headgasket is probably my fault, I was told it needed replacing.<br /><br />I would estimate around 1200 hrs. Its been very good to me. Been serviced by the book.

 

[jim dozier]

Re: Yamaha F100 Headgasket

I don't know the specific answer to your question. A good manual which you should be using would answer it for you. In general, I would not recommend using any gasket compounds on a head gasket, UNLESS the manufacturer says so. Most do not. Head gaskets are a good deal more high-tech in the new millenium than they were in the 60's when people were putting goop on their mating surfaces.

 

[rodbolt]

Re: Yamaha F100 Headgasket

Hello<br /> If I can remember I will look at the service manual tomorrow. I have not replaced one on that particular engine yet. I belive it goes on dry but I will double check<br /> good luck and keep posting

 

[jhnboat]

Re: Yamaha F100 Headgasket

bamafan,<br /><br />Looking at my factory service manual there is no indication of any sealant being used with the head gasket. (F100 service manual)

 

[dick]

Re: Yamaha F100 Headgasket

Clean of old material with acetone and let dry .Put on gasket dry ,lightly oil bolt threads then follow the 3 torque steps in the manual.

 

[bamafan]

Re: Yamaha F100 Headgasket

Thanks to all for the help. Its back on and seems ok. Compression is 179lbs +/- 1 lb on all four cylinders. Keep your fingers crossed.