Won't do this myself but would like to speak with someone who might be able to do it. Of course, I would need an estimate--not a quote. I may soon have two from 1984 with about 2100 hours that are still running. Should they be done now or wait until they quit with a serious problem? What life should I expect from these engines in a 38 Commander kept under 2500 rpm 95% of the time? At the same time I would likely do the original 1969 6.5kW Kohler generator that still sounds good, but all original. Any suggestions would be appreciated. Live near Detroit.
Before you go to that expense, take oil samples before you change oil and have it analyzed. That will give you a pretty good idea of the condition inside. I’ve done oil sample analysis on older engines and it works. Running them at lower RPM definitely extends their life.
Google oil sample kits to find. I’ve been using NAPA. Kits are sold on Amazon too.
Maurice Marwood said:
Thanks Joe. In my experience several samples should be taken to establish a trend and I may do that. Will also check smoke, blowby, sound, starting, etc. First probably do a tune up. Is there a particular lab knowledgeable about these engines to do a good interpretation?
Everything the previous posters have said, but I would put strong emphasis on how engines were used during previous life.....they've seen about 60 hrs per year...in a go-fast or family cruiser?...salt or fresh water?...FWC or RWC?....how stored off season, wet or ashore?......well kept, original appearence....or paint burned off exh maniolds, rusty intake etc?.....no rattle can makeover lol!
If you can determine they've had a good life thus far, then I'd do a compression test.....you have 16cyls for a good comparison.....if good, pull valve covers....nice and clean or sludgy?
If still looking good, I'd consider placing in service PROVIDED replacement of following:
new exhaust manifolds
new sea water pumps.....or at least rebuild with new impeller body kits
belts,hoses as needed and thermostats
any rusty pulleys
transmission drive dampers......cheap and easy to do now
Using your proposed operating limits with correct propping....maybe 500 hrs?
Good luck! ....454's are great workhorses!
Thanks, Reed. Good advice.
I can add the following
- new 1994, 80/hrs/yr
-Fresh water only,
-heated winter storage
-Maintained by boat yard and owner with "loving care".
-survey in 2016 indicated "no leaks, no abuse, clean and free of grease".
-engine stringers found to be sound according to 6-24 on GRP-33 moisture meter (whatever that means)