raw water slot sheared off engine-side

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Tourgen
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raw water slot sheared off engine-side

My C36 mk2 wasn't pumping raw water out the exhaust at the beginning of this season. I did the standard impeller maintenance and bottom cleaning, then checked flow through the pump. No flow. I removed the pump and found the sides of the slot that couples to the raw water pump shaft had sheared off.

How difficult is it to get this part out of the engine and replace it? Do I need to remove the front cover? I assume I need to get into the valve train as I understand it is gear-driven off of the valve train.

thanks

Tourgen
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OK looking through  the M-35B engine manual it looks like the slot is cast into the end of the cam shaft. great. The slot on #22 in the image I've attached. So I guess I'm buying and installing a new camshaft? Can someone please point me to a place to buy a good quality part? Thank you

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Haro
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I may not be a help to you to replace the cam shaft, but after you replace it be sure to install the ring that helps the slot from breaking. If you call Universal, they will mail one to you for free.
You can buy the cam shaft from a Universal supplier who is assigned to your area. 
I suspect it broke when you first started the engine this season. When you do not use the engine for an extended period of time, the salt water that is in the raw water pump solidifies and the pump shaft freezes in place. When you start the engine it will not turn and the fork or the slot breaks.  To put it back in service in the beginning of the season, remove the impeller and the shaft, clean and lubricate with lanoline, reassemble.
I upgraded to Oberdorfer for easy servicing.
Visit my website listed on my signature or find more content in this website.
let us know how you remedied the repair. 

Tourgen
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thank you for the info. I'll post again to this thread on how I do with the repair.

Tourgen
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thank you for your reply. I don't think my engine had that ring you spoke of, or if it did it's in the oil pan now. I'll make sure to call and get the ring when I do the cam shaft replacement.

Yes, I'll be sure to change the impeller every year now, check if the raw water pump shaft is seized, and grease everything up. I already bought the replacement raw water pump that's serviceable from the front cover plate, thinking that was the problem before I removed it from the engine.

I wonder if anyone knows if the cam shaft is available from Kubota and roughly what part # I should be looking for for a M-35B engine? my undetstanding is that these engines are Kubota engines that Universal modifies for marine use. Thanks.

Tourgen
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never mind, I found the part for my engine: 200874 for the camshaft and 044497 for the raw water pump sleeve. my engine definitely did not have this sleeve. The camshaft is $1,117 from Universal so hopefully I can find the Kubota part. Probably half that price.

rstonge
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I have had good luck sourcing Kubota parts from Messicks.  You need to know tractor model your engine came from as that is how they look up parts.  Here is a link:
https://www.messicks.com/KU/84492?sectionId=214915&diagramId=325030

Ron St. Onge

1995 Catalina 36 MKII Hull 1384

Tourgen
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This helped so much, thank you. Apparently my M35B engine is a V-1305E block Kubota which is in the B2710 tractors. Messicks has the part for $590.

I got the engine block/tractor cross-reference info from here: https://www.catalina36.org/members/encyclopedias/kubota-equivalents

hopeully it's correct or I'll be buying 2 camshafts. I'm going to look for #s on the block and dipstick tomorrow morning to maybe double check the info.

I also found this post that discusses replacing the camshaft without pulling the head, which I very much hope I can do. https://www.catalina36.org/forum/technical-discussion/dreaded-cam-shaft-...

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Haro
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Ron, visit this link regarding the ring for the camshaft
https://mei1970.org/saillavie/OberdorferReplacement/WesterbekeBulletin23...
 

Tourgen
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FYI to everyone, the cam re-enforcing sleeve is no longer available free of charge from Westerbeke. You must buy their kit, part # 48245. They've posted an update to the bulletin #235.

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Haro
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Thanks for the update on the ring.

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