1972 original westerbeke swap out help - SailNet Community
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post #1 of 19 Old 12-29-2007 Thread Starter
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1972 original westerbeke swap out help

Hi all,
Just had a gentleman offer me a 30hp yanmar 2000 year installed for 3500$ This would replace the last weak system on the boat, and, sadly, drain me of all my funds. The original westerbeke is a good starter and seems fairly reliable. I plan on keping this boat and have rebuilt every system except the engine. The only true problem is the original paragon transmission. Think I should repower or just buy a new tranny?
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post #2 of 19 Old 12-29-2007
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I don't know if you plan on installing the transmission yourself or if you plan on having someone else do it. It will cost at least 1/2 the cost of the 2000 yanmar and you still have a 36 year old motor.

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post #3 of 19 Old 12-29-2007
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Freesail's point is an excellent one...but you also may be trading for trouble, if the 2000 Yanmar isn't in good shape. From your OP I am guessing that the Westerbreke runs well and is in good shape, and that the only real issue is that the paragon tranny is shot. If the engine is in good condition, I think replacing/repairing the tranny might make more sense. If the 2000 Yanmar comes with a warranty, that would go a long way to easing my concerns about it and swapping it out.

However, you will probably need to replace your propshaft and engine mounts, since I seriously doubt that the Yanmar is a drop in replacement for the Westy. If these costs aren't included in the price of the new engine, then they are expenses you should consider.

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post #4 of 19 Old 12-29-2007
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If you use the engine a lot, I would go for the Yanmar, assuming it's low hours, but not because it's the better engine, but because it's lighter and very likely more fuel efficient.

You can double that figure, however, for the modifications to engine beds, shafts, etc. The engine replacement is usually half or less of the total cost of a repower.

If you keep the Westerbeke in good order, it might be a simpler process to source a replacement transmission. While the engine is out, consider a top-end rebuild. A rebuilt diesel with a new transmission is essentially a new engine, particularly if it is well-maintained. Absent, however, are the ancillary charges of modifying shafts, beds, and so on.

Imagine the Westerbeke with a rebuild, new hoses, new seals, cleaned out and realigned injectors, fresh paint in your mind's eye. Looks nice, doesn't it?
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post #5 of 19 Old 12-29-2007
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My experience with a 1972 Westerbeke/Paragon has been that the Westerbeke is fine, the Paragon slightly troublesome. However both can be (and have been) rebuilt. Warning - the cost of having someone else remove the transmission will equal the cost of rebuilding it and the cost of re-installing it is about the same.
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post #6 of 19 Old 12-30-2007
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36 years of operation tells you something about what you have. the yanmar only has it's name behind it, nothing else. if parts are still available, and especially if you can source non-westy parts for it, i would definitely keep it stock. i can rebuild my westerbeke 30 for under a grand, and so i'll never replace it with a modern engine.

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post #7 of 19 Old 12-30-2007
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I smile at you Americans. In the UK, the term "tranny" is oft' used to describe one of those very different gentlemen who dresses up like a woman and has a handbag and lipstick and stuff.
It is jargon for a longer word meaning the same.


Keep the old motor, and change the transmission.
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post #8 of 19 Old 12-30-2007
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Lightbulb Maybe fix both

I not sure of your mechanical ability and I never worked on a "Marine" Transmission.

I looked at a Diagram of a Paragon Transmission;
http://www.marinetransmissions.com/manuals/paragon.html

They look to be similar in concept of operation. So, what I seeing looks like a Clutch Pack Assembly like Car Automatic Transmissions, I may be wrong.

If, you going to do the labor of removing Engine and Transmission, both or one, whatever. You may be able to do a little phone work with some Parts Dealers (I never limit myself to only Boat Dealers for parts). Many times places like NAPA can be a surprise for something we would not believe they would have.

So, you may be able to buy a Clutch Pack and it may not be hard to install or maybe you can figure out something.

Basically; do some phone work, ask around, get to know some part sources for your area and you may do well keeping what you have. You know how reliable they are, just need a little TLC after a long time of work. You buy something else you not sure what you getting until later down the road.

I guess I am the type, if my engine and transmission have proved themselves. I not want to lose them if I can fix them.

All the rivers run into the sea, yet the sea is not full.
Ecclesiastes, 1:7
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Last edited by Gryzio; 12-30-2007 at 09:11 AM. Reason: spelling
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post #9 of 19 Old 12-30-2007
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Curiosity begs. What's the boat? What model engine?
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post #10 of 19 Old 12-30-2007
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I would not trade a 36 year old engine that I know is a good one for an eight year old engine that I know nothing about. If you can't go new then keep what you have
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