The joys of boating

[Jalepeno]

Started up my 37 year old YSM12 at the dock last night. Started on the second compression stroke as usual but she sounded a bit strange. Checked the engine compartment and found lots of exhaust smoke and water spraying. The stainless steel exhaust nipple (between the manifold and the mixing elbow) had broke flush with the bottom of the mixing elbow. The exhaust system is nine years and 257 hour old. Well there goes another "boat buck". Parts are about CDN$750 with taxes and two weeks delivery. I will try to do it myself and save a couple of hundred. Sure glad it did not happen on my northern cruise planed for May. Would make it very difficult (expensive) to get her back back to my home marina. A working motor is critical on our rocky and wild coast.

 

[Charles Erwin]

I hope this does not come too late in the process and maybe helps.

The threaded nipple or coupler that connects the exhaust neck (at the cylinder head) and the mixing elbow itself is worth maybe $40 US including the gasket at the cylinder head. You should not need a new elbow nor the neck (that is bolted to the cylinder head) either. Verify by removing the fasteners at the cylinder head - then take the whole thing to your shop to disassemble with pipe wrench and heat. Thread remnants can be pried (knocked) out of the adjacent part with a slim hardened punch and hammer.

If you can't get it apart your local machinist can. That is worth $20 US.

Charles

PS Upon reassembly the coupler (male) threads are right hand one end left hand the other end

 

[Karyon]

did you know BOAT stands for " Bust out another thousand"

 

[druid]

Sorry to hear that Jalepeno. Welcome to the Wonderful World of Expensive Yanmar Parts!

druid

 

[Jalepeno]

Thanks Druid, the Yanmar mixing elbow and the left/right thread connector are in stock and the exhaust manifold elbow and gasket should arrive this week. The exhaust manifold elbow is very rusty and may be original. The mixing elbow and connector are only nine years and 257 hours old. My philosophy is to replace all of the parts even if they have not failed yet. The additional labour cost to reuse them is not worth it. I tried to remove the three mounting bolts to remove the exhaust assembly but they don't want to come out of the cylinder head even after lots of penetrating oil soaking. Kerry at Vancouver Outboard said his crew can get it off with an impact wrench (12mm hex head machine screws). I've got them organized to do the whole job. Can't be more than a couple hours at about $100/hour + taxes, as long as a bolt doesn't break. Hope to have her ship-shape sometime next week.

How is your motor installation going? One thought I had, does your new motor's output shaft rotate in the same direction as before? The prop walk could be a beast if it rotates in the opposite direction. I think you said the Ontario's propeller location on the port side is to help cancel the prop walk.

 

[druid]

Oh, getting out exhaust bolts - I feel for ya! How clogged is the elbow?

My work is going... slowly. See my other posts on stern tubes, engine swap... Yes, I believe the prop rotates the same way as the old one. But I don't really see prop walk as a disadvantage - it's only a problem if you don't know about it. You can use it to your advantage most times.
My two stopping-blocks right now are: 1. The 1" dowel I'm using to align the stuffingbox and make the stringers the right height won't fit through the 1" cutlass bearing or the 1" stuffingbox - have to sand it down a bit. And 2. I have to cut 1 3/8" off the stringers and so far it looks like a Skillsaw is NOT the right tool. I'm gonna try a Sawzall next...

druid