Can a 110hp Yanmar replace 130hp Perkins

[SailRedemption]

Originally Posted by bluenomads

So rebuild = take out and put back?
(You can tell I haven't had an inboard diesel before!)
A boat I'm interested in definitely doesn't make that easy. It has 135hp 6 cyl Perkins. It's an aluminium hull and as far as I can see it would require removal of part of the hull side to remove the engine - no possible access from above or either end at all! At least welding it up afterwards would be possible . Hence my query as to whether you can rebuild in-place?

Yea, take out and put back.. I'm sure you could take it apart and bring the pieces to a shop and they will overhaul everything. Then give you the pieces and you or they could assemble it in the boat.

My family owned a marina and boatyard for 37 years and I have seen more than a couple boats with a hull side cut out to remove engines and/or fuel tanks. They were glass but metal would be just as easy if not easier.

[a64pilot]

First changing engine brands if you will will take most likely all of those things bilgewater listed, an overhaul is an R&R job, much less expensive, much less.
If so had to cut a hole in my boat to remove an engine, I would look real hard at what is often called an inframe rebuild.

[SailRedemption]

Originally Posted by a64pilot

First changing engine brands if you will will take most likely all of those things bilgewater listed, an overhaul is an R&R job, much less expensive, much less.
If so had to cut a hole in my boat to remove an engine, I would look real hard at what is often called an inframe rebuild.

Right in frame, I didn't know the proper term for taking it a part large piece at a time in the boat. Perkins are so common, you'd probably be able to find a complete YouTube video on how to disassemble and assemble one.

[kmacdonald]

A lot of people on their third or fourth rebuild think that's the way to go. Tales of a $2500 rebuild don't include removal, install, peripheral equipment like starters, water pumps, alternators, exhaust manifolds, heat exchangers, fuel pumps, injectors, hoses, belts----you know, the stuff that usually goes wrong. Now if you plan on doing the work yourself, that could make a difference in your decision. Try and look at it in a realistic manner and make sure the engine actually is worn out or is it just the peripheral equipment going bad all the time.

[nhschneider]

The M135 Perkins is a great engine but I think its weight-to-horsepower ratio is too high - possibly one of the reasons why they last so long.

We considered the Yanmar 110-hp for our 40,000-pound ketch but it came with a ZF25 transmission which is too small for that horsepower and torque. We ultimately replaced the Volvo MD40A with a Beta Marine 90, which came with the ZF45 transmission. We’re delighted with the Beta and have over 3,000 trouble-free hours on it. We consume slightly less than a gallon per hour cruising at 5.5 knots. However, the naturally-aspirated Beta 90 is no longer available in the USA (doesn’t meet EPA standards). Since I strongly feel that turbocharged diesels are a poor choice for a cruising sailboat, I’d probably choose to rebuild the Perkins if it were my decision.

Fair winds and calm seas.

[Milko Berben]

Older Perkins engines can be rebuild very nicely I did many generators Perkins engines if it is done correctly you will have an engine at a fraction of the cost as new plus you will have a lot of spares from the old engine which where replaced for quality reasons but will still work to bring you home. I would go with the rebuild Perkins.

[Compass790]

I'd go with the Beta if repowering simply because of the parts prices. But I'd rebuild if you can do the work yourself. Depends on yr finances I guess