Force 50 Problems
I was fishing a tournament out of my little boat yesterday. I have a 1990
50HP Force model 507F90C on that boat. It suddenly started running crappy. I
pulled it off the main river and pulled the cowling. I pulled both spark
plugs to see what the condition was. The upper plug looked perfect, but the
lower one was pretty clean except for some grey milky oil. Looks like water
mixed in oil to me. I didn't have any choice, so I ran it back up river to
the marina where I launched from. It ran on one cylinder all the way.I just checked compression on it this morning. I got 152 PSI on the top
cylinder, and about 90 on the lower cylinder. I poured some two stroke oil
in the lower cylinder to help lubricate the cylinder and see if the rings
were bad. Even with a couple ounces of oil in the cylinder it still only
read 90 PSI. I am guessing head gasket blown through to the water jacket. Pretty simple
fix. Is there anything else I should look for? Bob La Londe
Fishing and Boating Forums
http://www.YumaBassMan.com |
Bob
Jun 6
2004
|
| I had a Force 75 hp, a 1995 model. I made the mistake of trying SplitFire
sparkplugs in the darned thing, even though it ran perfectly, I was trying
to get a little more out of it. It ran like a raped ape for a short while,
then started missing and running crappy. There was a hole burned in the side of the number one piston. The mechanic
told me that this was a common problem with that particular engine. I
luckily I got the powerhead replaced under warranty. |
Steve
Jun 6
|
| You are telling me I should pull the head before I order any parts then?
LOL.
|
Bob
Jun 6
|
| It might not hurt. |
Steve
Jun 6
|
| Fortunately it only took a couple minutes. The piston has very minor
spatter marks. Looks like it has been getting a little bit of water for
quite some time. It was very clean, but fortunately no rust. The gasket
just picked now to completely give up. The gasket is definitely blown the
metal rim was gone for over and inch, and a small piece of the fiber was
missing directly into one of the water ports. Even better news. The cylinders have no discernable ridge. I didn't mic it
as I don't have an inside micrometer, but doing the finger nail test I could
not feel anything at all. I think this motor has very very few hours on it.
Cool deal.
|
Bob
Jun 6
|
| Sounds rebuildable to me. You, my friend were very lucky. |
Steve
Jun 6
|
| You store your boat outdoors Bob? Warren |
go-bassn
Jun 7
|
| Yes. Why?
|
Bob
Jun 7
|
| That's the number 1 cause of gaskets going, hoses cracking etc. I know in
many cases it's unavoidable. Your area has pretty harsh temp extremes too,
doesn't it? Warren |
go-bassn
Jun 7
|
| Yeah sometimes 40 degrees change from night to day. I've been trying to
figure out how I could get the boats in and out of my side yard where I
could reasonably put up a shade, but its tough. I may have to break down
and buy one of those electric trailer movers in order to do it.
|
Bob
Jun 7
|
