Thread: 1996 SL 900 re build
09-18-2008, 11:34 AM #1
1996 SL 900 re build
Alright, new project!
So we have an SL 900 that met its fate about eight or nine years ago when after a quick oil refill boatside the cap was left off the oil reservoir. Well, one thing led to another and soon enough we had some pretty beat up pistons and cylinders, siezed one of em up pretty good.
Well here we are finally in the year 2008 ready to rebuild the thing. Now, my Dad has taken good care of the boat, the crankshaft has been regularly lubricated in the case and the carbs are in real good shape too. The cylinders and pistons have been off the boat for a few years.
The cylinders finally were bored a few weeks ago to match the 20 thousandths over wiseco pistons we have for it and last weekend we set out to rebuild the top end and get the ski going!
Well, we got the pistons and the cylinders on without any problems but we noticed that the bendix wasn't disengaging after we hit the starter so we decided to take the flywheel cover off and do some looking around. Before we did that though, we did get the engine to fire so that was nice.
Anyways, we ripped off the flywheel cover and found that the bendix was in pretty rough shape, with some WD and a little massaging though, we got it to work, but this is where it gets interesting.
Peering down into the front of the boat (near the flywheel cover) I noticed a little piece of debris....hmmmm what could this be??? Once I picked it up I discovered that it was a piece of a tiny little spring....hrmmmm
So...we peaked around a little more...found a few more pieces of little spring. Now we track back in our heads....that wasn't there before we took the flywheel cover off. So the flywheel cover comes back off and we find another piece of this mystery spring.
By the time its all said and done, we convince ourselves that its the front crank seal spring and we just decide that we shouldn't just be slapping a top end on an engine that's been sitting open to the atmosphere for nine years and we lift the engine from the hull.
Well, we rip the flywheel and stator off....and the front crank seal spring is there...what the hell could this spring have been????
Anyways, we are going to split the case over the winter and do a complete overhaul. Since its September we weren't too worried about getting it running quickly, we will take the winter to make it right.
Here are some pictures, the mystery spring is in the picture next to a stator seal.
09-18-2008, 01:43 PM #2
The spring you found goes around the weights on the bendix. Actuate it and you will see the grove the spring sits in.
09-18-2008, 04:05 PM #3
Okay so will we need a new Bendix? How critical is that piece to performance?
09-18-2008, 04:38 PM #4
Critical to performance none but a stuck bendix could ruin your day.
09-18-2008, 09:25 PM #5
- Join Date
- Aug 2006
- Pittsfield, MA
I vote "change it now"
09-19-2008, 12:20 AM #6
Well, the engine is out and the flywheel is off, certainly seems like a good time to do it!
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