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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > To Rebuild or not to Rebuild that is the question
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Topic Review (Newest First)
02-20-2014 08:10 AM
H and E
Re: To Rebuild or not to Rebuild that is the question

My little Universal diesel over heated twice because I was not paying attention. After the second time I was more careful. However, after about 3 more hours of use it made a scraping noise and quit. It would restart but the noise was still there. I had it rebuilt. The engine shop had to replace a bent rod. Because it is a Kubota based engine I stripped it to the basic engine and sent it to a Kubota engine shop. Because the boat was new to me I had no idea of the engine history.
02-14-2014 07:26 PM
dabnis
Re: To Rebuild or not to Rebuild that is the question

An oil analysis may show any abnormalities, but it may be difficult to know if they are caused by short term or long tern problems. As mentioned, a compression test may show which cylinder, if any has a problem. The "miss" may be caused by a bad injector, perhaps damaged by the heat? If you are not losing coolant or oil and it runs OK, you may be lucky?

Paul T
02-14-2014 04:27 PM
miatapaul
Re: To Rebuild or not to Rebuild that is the question

I agree with all here, that if there are issues with the motor rebuild it. I think if you can take apart an A4 you should be able to tackle this. A little more complicated but not much. But only worry about it if you have real trouble. compression test, and you might want to have the oil analyzed. (I have used Blackstone, they give a nice summery of the results but there are others) While it may not tell you much about if it is good, it will give you a baseline to start from to watch levels of metals and what not.
02-14-2014 04:08 PM
desert rat
Re: To Rebuild or not to Rebuild that is the question

Newhaul hit it on the crank. Compression test cold and hot. Diesels are almost like gass just higher compression. Every engine needs oil pressure and temp sensors. If you haven't changed the oil you can do an oil analisis. As you can see I can not spell.
02-14-2014 03:02 PM
zeehag
Re: To Rebuild or not to Rebuild that is the question

monitor exhaust for color and consistency. first change oil and see if there is any metal in the oil pan...
02-14-2014 02:04 PM
SloopJonB
Re: To Rebuild or not to Rebuild that is the question

At least change all the fluids before going any farther. Overheating cooks engine oil and coolant.

A compression test would be the next step.

Then read Porfin's as yet unfinished thread about re-building his 4108.

If a fresh engine is needed, definitely rebuild it - a swap is a huge job and will cost WAY more than the already shocking cost of a new crate engine - 30%-50% more if you do everything yourself, probably double if you just write cheques. Either way a new crate engine, installed, will cost as much or more than your boat is worth.
02-14-2014 01:53 PM
gamayun
Re: To Rebuild or not to Rebuild that is the question

If you do need to rebuild it and don't, someone's going to get a steal on yours. I'll second the opinions here (especially about installing a temp alarm) and reiterate my sister in arms, Zee's point that diesels are easy; anyone can work on them. Granted, I haven't had to pull the pistons, but have done a lot of other things that once I got over my trepidation, were surprisingly easy, and much easier than gas engines. There is a ton of info on the web. I just picked up a recommended diesel book on Amazon for $1 that arrived in brand new condition. List Marine has diesel classes that I hear are very popular. I'll be attending their next one Feb 22. Good luck!
02-14-2014 01:48 PM
deltaten
Re: To Rebuild or not to Rebuild that is the question

Simple math;
New motor @ $12k (?) plus install/labor
vs
re-build @ $6K (?) all done!

Just swags AFA prices,going by posts in the past year
02-14-2014 01:47 PM
CaptainRahnn
Re: To Rebuild or not to Rebuild that is the question

Forgot to mention I did change the impeller on the raw water pump the next day. I found 3 fins broken off...all were still in the pump. I have considered a compression test. Going out today and run it for a while see what's up.
02-14-2014 01:16 PM
jrd22
Re: To Rebuild or not to Rebuild that is the question

You should always replace the thermostat(s) after overheating an engine, at a minimum. You should also change the raw water impeller if it was starved for water and if it is missing pieces you need to look for them in the heat exchanger. If it starts OK when cold you still have good compression so the basic engine isn't toast. If it isn't using coolant then you probably don't have anything to worry about. I won't comment on the rum/night/boating thing.
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