Hi all, my 1st post, congrats on the nice website btw! I've got an old yanmar 8hp inboard that's it a bent intake valve due to being water locked which was due to the water cooled exhaust falling to pieces on the last run. I'm thinking of buying a small 8-10hp outboard and sticking it on the back and then later fixing the yanmar as its a big job to pull it out . I'm on a mooring and there is no slip where I live and very few mechanics around to help. Any thoughts?
Out with the old inboard, in with e the new outboard??
- Thread starter Lazysailer
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No hint, even on your profile about where you boat. Much of the boating season is over. Be a good time to pull the diesel and take it someplace where there are mechanics.
Decent OB will be $1000 bracket annother couple of hundred.
I'd save the money. 8hp diesel can't weigh much more than a hundred pounds. Rig a hoist with your main sheet, pull the engine and set it in the middle of your dingy. If you can beach the dingy and get a helper to lift the motor out and onto some corrugated or plywood, you can sled it to your car, put it in the trunk and take it to somebody. If not, take your main sheet with you and pull the engine up onto the dock with it. Put it in a dock cart and wheel it to your car.
Decent OB will be $1000 bracket annother couple of hundred.
I'd save the money. 8hp diesel can't weigh much more than a hundred pounds. Rig a hoist with your main sheet, pull the engine and set it in the middle of your dingy. If you can beach the dingy and get a helper to lift the motor out and onto some corrugated or plywood, you can sled it to your car, put it in the trunk and take it to somebody. If not, take your main sheet with you and pull the engine up onto the dock with it. Put it in a dock cart and wheel it to your car.
No info on the size of your boat. An 8-10HP gas outboard may be inadequate for a boat displacing over 5,000 lbs. To repair a bent valve there is no need to remove the engine from the boat. The cylinder head on a single cylinder yanmar is held by 4 head bolts and it is light and small. You can take it to a reputable marine mechanic and they can true it and replace the guides and valves and hand it back ready for installation. If you do not feel confident about removal and installation you can get a friend to help or hire a regulr mechanic to come to the boat. The problem with outboards is 1) the fuel 2) keeping the propeller in the water 3) performing maintenance over the transom and 4) low speed maneuverability among others ($$).
Just some food for thought here. You may not need to remove the engine.
I had a YSE8 in my PY26 and it has possible to remove the head without removing the engine from the boat. Idid have to dismantle a bit of the joinery around the engine but luckily it was all attached with screws.
Assuming yours is a YSE 8 or is of similar construction, taking the head off is really quite simple. Remove the valve cover and undo the 4 headbolts. That's it.
Matt
I had a YSE8 in my PY26 and it has possible to remove the head without removing the engine from the boat. Idid have to dismantle a bit of the joinery around the engine but luckily it was all attached with screws.
Assuming yours is a YSE 8 or is of similar construction, taking the head off is really quite simple. Remove the valve cover and undo the 4 headbolts. That's it.
Matt
I agree with others
You can probably repair the little diesel for close to the same money, or possibly less than buying a small outboard. And have none of the problems associated with small outboards.
You can probably repair the little diesel for close to the same money, or possibly less than buying a small outboard. And have none of the problems associated with small outboards.
I agree with the other guys. I used to have a Yanmar YSM8 1-cylinder diesel just like what you likely have. It is a workhorse of a lil engine. They are ususally always worth repairing & or rebuilding. If you know enough to deduce that the valve is bent then U should be able to figure out how to remove the head & rebuild the valves. The money U spend on an outboard will not improve the value of your boat, but a working inboard does. Fix the existing diesel which will likely cost less then the outboard & will retain the value of your boat.
On those one lunger Yanmars, you can remove an access cover plate and undo the rod big end. With the head off, you can pull the piston in situ (provided there is the room) and completely overhaul the engine, if you wanted, short the crankshaft.
A bent valve may or may not have damaged the piston. If you know for a fact it bent a valve, you must already have the head off and can visually see the piston as well as any damage. Without head removal there is no easy way to determine a bent valve.
HP for HP, youll never come close to the longevity, reliability, and efficiency of most diesels, and Yanmar makes a really good one. I would fix it and completely forget the outboard idea.
A bent valve may or may not have damaged the piston. If you know for a fact it bent a valve, you must already have the head off and can visually see the piston as well as any damage. Without head removal there is no easy way to determine a bent valve.
HP for HP, youll never come close to the longevity, reliability, and efficiency of most diesels, and Yanmar makes a really good one. I would fix it and completely forget the outboard idea.
You have two clear choices. One, watch the Red Green Show, or, two, fix the diesel. The exhaust parts will run a couple hundred. The mixer elbow is most of that. The valve job, if you take the parts off and put the repaired parts back, should not break the bank.
If you are not good with a wrench, hire someone to do it all. Will still cost less than messing with a gas engine on the stern.
The gas idea is not the way to go.
If you are not good with a wrench, hire someone to do it all. Will still cost less than messing with a gas engine on the stern.
The gas idea is not the way to go.
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