Join Date: Sep 2006
Thanked 13 Times in 13 Posts
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Re: don't let the motor freeze....
Well, the replacement cylinder barrel arrived yesterday, after quite a search for one.
I will pull off the old barrel (cracked), swop the liners, paint up the outside of the barrel to improve the cosmetics, and rebuild.
I have to swop the liners as the original liners are using oversize pistons.
With the same liner in there, I should not have much trouble getting the bumping clearance right.
It is not the most difficult job as the USC Polaris 36 has good access to the motor.
I cannot face a new engine right now - some other time perhaps.
Of all the things the designer got right - and he got plenty right - the 35 hp Volvo MD17C motor and the 18x12 twin blade prop move the ship's 11 tons (laden) well.
The cast iron motor is very well built indeed, but you'd better pray that nothing serious goes wrong.
At 1700 rpm, it pulls well, and tops-out at 2250 rpm (max stated power is at 2500 rpm).
I would rather be a little bit over-propped than (food-whisk) under-propped.
One fault of the Volvo scene though, is that the spare parts have always been terribly expensive, even when my 40 year old motor was half that age.
Next motor will not be a Volvo, and that for me is a pity, as all they would have to be is more reasonable with the cost of their spare parts.
Next motor will be the Japanese Kubota, probably the 38 or 42 hp OHV, mechanical-injected motor.
It must be OHV... no OHC for me, boys, and no CPU controlled common rail stuff either.... if the CPU goes down, that motor stops dead. I had it happen with a car. heaven help us if it happens with the boat.