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Old 26-09-2021, 18:14   #1
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Question Engine work from recent survey. How bad is it?

We got the survey back and we're not sure how bad these problems are. We started googling how to do them ourselves but realized it may be better to leave it up to the professionals for the first time, and just watch/learn.

Are these problems worrisome enough that we should walk away? We weren't sure if its 10hrs or 200hrs worth of labor.

Yanmar 315hp

Engine 1
  • Port engine seacock and intake elbow need to be replaced.
  • Rebuild/replace seawater pump
  • Remove, clean, and test heat exchanger, oil cooler, fuel cooler, and engine aftercooler.
  • Replace all engine cooling hoses and clamps as needed.
  • Refill engine cooling system.
  • Complete engine corrosion cleanup is required on the lower part of the engine block.

Engine 2
  • Have Yanmar tech test oil pressure to determine why the gauge was reading low.
  • Replace the worn exhaust hose from the exhaust elbow outlet.

Thank you.
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Old 26-09-2021, 18:25   #2
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Re: Engine work from recent survey. How bad is it?

how many hours are on each engine ?

cheers,
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Old 26-09-2021, 18:26   #3
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Re: Engine work from recent survey. How bad is it?

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how many hours are on each engine ?

cheers,
around 2k on each.
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Old 26-09-2021, 19:54   #4
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Re: Engine work from recent survey. How bad is it?

Who pays for the repairs? Usually the seller. The only serious problem is the low oil pressure and that's simple to check with a mechanical gauge. Everything else is easy.
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Old 26-09-2021, 20:15   #5
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Re: Engine work from recent survey. How bad is it?

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Who pays for the repairs? Usually the seller. The only serious problem is the low oil pressure and that's simple to check with a mechanical gauge. Everything else is easy.
Great to know. Thank you.

How serious are we talking about in a worst-case scenario for the low oil pressure?
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Old 26-09-2021, 20:21   #6
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Re: Engine work from recent survey. How bad is it?

Can I assume these engines are 6LPA series? The low oil pressure is a potential problem although the Yanmar senders fail fairly often, a reading on both engines with a master gauge connected will confirm or eliminate the faulty sender/gauge theory. I’d be concerned about the “ complete engine corrosion cleanup” it must have a raw water leak, possibly on the mixer elbow or any of the pipe work or coolers and usually it’s best to lift the engine out to do a respectable cleanup..... and fix the leak source. Without actually seeing photo’s of the corrosion it’s Only possible to guess how far this extends and it’s possible that the wiring and starter motor has been affected as well. I’m also suspicious of the recommendation to remove,strip and test all the coolers did the engines overheat or blow black smoke on the sea trial? Low on power? And why is the engine cooling system needing to be refilled? These are fairly chunky expensive engines to work on and even if they’re just 4LHA,s the bill will be ...... not small.
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Old 26-09-2021, 21:06   #7
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Re: Engine work from recent survey. How bad is it?

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Can I assume these engines are 6LPA series? The low oil pressure is a potential problem although the Yanmar senders fail fairly often, a reading on both engines with a master gauge connected will confirm or eliminate the faulty sender/gauge theory. I’d be concerned about the “ complete engine corrosion cleanup” it must have a raw water leak, possibly on the mixer elbow or any of the pipe work or coolers and usually it’s best to lift the engine out to do a respectable cleanup..... and fix the leak source. Without actually seeing photo’s of the corrosion it’s Only possible to guess how far this extends and it’s possible that the wiring and starter motor has been affected as well. I’m also suspicious of the recommendation to remove,strip and test all the coolers did the engines overheat or blow black smoke on the sea trial? Low on power? And why is the engine cooling system needing to be refilled? These are fairly chunky expensive engines to work on and even if they’re just 4LHA,s the bill will be ...... not small.
Correct on 6LPA.

Lifting engine out sounds like a massive job. What does something like that with the cleanup run?

Yeah the engine went to 201f during the sea trial and triggered an over-temp alarm.

I appreciate the detail on all of this. Any idea roughly how many hours it may take to fix some of these for a professional?
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Old 26-09-2021, 21:37   #8
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Re: Engine work from recent survey. How bad is it?

Unless you're getting a great "as is" price it seems best that the engine temp is returned to a satisfactory reading by the seller, not yourselves. Along with proof of the work performed. This would be to ensure that some "magical mystery elixir" was merely used as a bandaid.

I would further ask the surveyor if the engine rust is extensive enough to require an expensive lift. If it's necessary to go that route then you'll need an estimate or two from professionals and ask for at least that amount in a discount to the contracted price.
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Old 27-09-2021, 00:55   #9
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Re: Engine work from recent survey. How bad is it?

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Originally Posted by KingGuppy View Post
Correct on 6LPA.



Lifting engine out sounds like a massive job. What does something like that with the cleanup run?



Yeah the engine went to 201f during the sea trial and triggered an over-temp alarm.



I appreciate the detail on all of this. Any idea roughly how many hours it may take to fix some of these for a professional?


The time to do the work depends on a number of factors ie access to the engine, a good liftout access, .... type of connection ie sterndrives, waterjets or regular shaft and gearbox. Not knowing the installation , the extent of the corrosion and the reason for the overheat makes it impossible to estimate the time to do the job but more than a week if things went smoothly ....with no surprises.
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Old 27-09-2021, 03:46   #10
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Re: Engine work from recent survey. How bad is it?

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Originally Posted by Lepke View Post
Who pays for the repairs? Usually the seller. The only serious problem is the low oil pressure and that's simple to check with a mechanical gauge. Everything else is easy.
Most of it sounds simple...but it depends how bad some of these issues are.

If the OP pays a yard to do the work, it's like at least a few thousand.

If the corrosion is bad, may need to pull the engines to replace oil pans. Also if bolts are seized/rounded off, some of the simple stuff may take hours.

And as someone mentioned...what does engine access look like?
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Old 27-09-2021, 04:11   #11
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Re: Engine work from recent survey. How bad is it?

These are big complicated engines , get quotes and use a good engineering service yanmar approved. Spares are expensive. The low oil pressure needs to be resolved
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Old 27-09-2021, 09:17   #12
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Re: Engine work from recent survey. How bad is it?

Engine 1 is mostly maintenance, so presumably engine 2 will need the same. I would say that apart from item No 3 all are down to the seller. Hope that you had a compression test as well.
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Old 27-09-2021, 09:18   #13
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Re: Engine work from recent survey. How bad is it?

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Originally Posted by KingGuppy View Post
.......Are these problems worrisome enough that we should walk away? We weren't sure if its 10hrs or 200hrs worth of labor.
What year, number of hours, last engine service (and scope of services)?

Yanmars are great engines. The survey list looks like deferred PO maintenance and very manageable. Looks like a thorough engine survey list of maintenance items. Get one or two marine engine mechanic cost estimates and then decide.
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Old 27-09-2021, 09:56   #14
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Re: Engine work from recent survey. How bad is it?

KingGuppy where are you located and this catamaran that you are looking at... I am in Tampa Bay.

Looking at the report on the one engine it looks like the PO had some sort of raw water leak that dumped sea water all other the engine.. A little rust on a marine engine is not bad but his recommendations with the hose replacements sounds like the engine overheated. The necessary cooling for turbos is tremendous and I would only recommend turbos for trucks. The surveyor is probably concerned with clamps failing.

Are these engines turbocharged? If you look on this site and I saw on one YouTube channel the turbo Yanmars are not that great. A friend had a problem with his power boat with a turbo yanmar and never got over the turbo lag went it was rebuilt.

If you are so mechanically inclined.. Most of the stuff can be DIY'd.
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Old 27-09-2021, 10:52   #15
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Re: Engine work from recent survey. How bad is it?

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Originally Posted by mholtzberg View Post
............it looks like the PO had some sort of raw water leak that dumped sea water all other the engine. A little rust on a marine engine is not bad.........Are these engines turbocharged?.........
Guessing the engine is a Yanmar LPA (2) Series Marine Diesel Engine (315mhp) The turbocharged, overhead-cam 6LPA-STP2. For what is worth my last and current sailboat had/has a 40/75 hp turbocharged Yanmar engines and are very good engines.

I had a port engine side raw water pump pinhole leak that resulted in a rust on the port engine mounts. It was easily removed then coated with a special rust resistant paint.
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