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Old 08-14-2012, 02:54 PM   #41
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The real question is: How many of you would repower with the same brand of engine?
I would,if I was happy with the current set up.If I knew I could get more/better economy,I'd ditch and go with another power package if it was a reasonably priced.
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Old 08-14-2012, 03:29 PM   #42
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If I could just drop in a new FL120, I'd do that. If I could drop in a NA anything else with no, or extremely minor, mods I'd go with something more modern. JD or Lugger, maybe.
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Old 08-14-2012, 04:25 PM   #43
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The real question is: How many of you would repower with the same brand of engine?
I would rebuild or replace with a rebuilt identical engine if possible. It's a much simpler job leaving controls, instruments, transmission, etc. in place.

It's possible a more modern engine would be more efficient but it would take thousands of hours to make up the extra cost.

The engine in my boat is pretty well matched to the boat.
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Old 08-15-2012, 01:17 AM   #44
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The real question is: How many of you would repower with the same brand of engine?
I did.

The cummins B series engine is an extremely popular power plant. Parts are available nationwide, service is pretty easy, and if the problem is over my head there are factory technicians almost everywhere in North America.
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Old 08-15-2012, 03:42 AM   #45
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Why only Volvo vs Lehman?

Yanmar is probably the best boating engine. But maybe not for slow trawlers.

Lehman lasts forever, and should only be replaced by other similar engines. RPM up to 2500 and slow cruising will keep any engine alive for decades!
Faster engines wear considerably more than these, and should not be directly compared...

My trawler has the original Lehman engine from 1980, and it runs like clockwork!

The sparepart market is obviously different in Europe than in the US. Volvo parts is found in any city and even in small marinas, whilst parts for Ford must be ordered.

Still I will never toss out the Lehman! First of all because it runs so well, but also because of all the other gear that will need to be replaced with a faster running engine. And ofcourse, the trawler is buildt for low cruising speed.
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Old 08-15-2012, 05:48 AM   #46
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I would rebuild or replace with a rebuilt identical engine if possible.

Great idea , but not all engines have a Factory rebuilt engine avilable.

The boat yard will NOT have the ability to rebuild an engine , that takes a full machine shop , perhaps with special tools for your engine.

A rebuild is stripped to the block, the block boiled to get it clean.

Then it is checked to see if there is no problem and it will be re machined.

The crank will be aligned bored as will the cam .

The cylinders will be bored and trued to 90deg to the crank.

The crank and cam will be straightened , the bearing area ground , and then bearings of the now proper size will be ordered.

I could go on , but you can see that only a specialist shop can do this easily.

Tossing in new bearings and a set of rings (most boat yard inframe "overhauls" ) will perhaps keep an old engine working a few more years , but if your going to remove the engine, it should be properly rebuilt.

Ask if you will get a "Build Sheet" or blueprint(all the bearing ID & OD and the specs for the rebuild ), if they look at you strangely , go elsewhere.

I would add the step and send the reciprocating to a "speed shop" for crank balance , rods end for end ,wrist pin& pistons matched , the flywheel balanced .

Tell the shop your normal idle and cruise speeds and they can counterweight the crank for SMOOOOTH!

Then you have a Keeper that will excel and raise the number of hours to the next rebuild.
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Old 08-15-2012, 07:59 AM   #47
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OK
Sorry, I did not know this was a thread abt rebuild.
I thought it was covering comparison of engines :-)

As said in Scandinavia:
"The great thing about Volvo engines is that there is spare parts everywhere, and the poor thing about Volvo is the likelihood of needing spares"
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Old 08-15-2012, 10:11 AM   #48
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Maybe in Scandinavia Volvo parts are "everywhere", but not here in the US of A. Volvo readily admits they will not support their older products.
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Old 08-15-2012, 12:01 PM   #49
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And the only "support" for most stuff is that the local Viking will order it shipped to himself , on your dime of course.

Volvo is also really crappy about warentee work , will pay for almost NOTHING!
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