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jfraley 05-16-2005 09:07 AM

twin 617.951 turbo diesels in my boat
just an update to the forum.. have bot of my 617.951 turbodiesels running in my boat project.. attached to the marine transmissions and almost ready for a sea test..

anyway, lots of photos and a few video clips fo the engines running in the boat.. and a nice exhaust note thru the marine exhaust..

check it out:

cracker928 05-16-2005 09:39 AM

Great pics! I've been wondering how this project was going....

midgard 05-17-2005 01:45 PM

That is an amazing project, I belive. I can't wait to see some videos of the boat running on water.

cracker928 06-18-2005 07:23 PM

Is there any news on this?

jfraley 06-19-2005 10:20 PM

snap clink crunch
well the first sea-test was pretty sucessfull, discovered a few leaks and solved a couple other problems.. but that test never really got much above idle, anyhow today (sunday) it went back into the water for a range of other tests and everything was flawless until I had her wide open and was just starting to come up onto plane and the stbd side motor broke the timing chain...crunch... game over for now.. but the nice thing about having two engines is the other one will get you home.. and it did just perfectly..

I think I have everything dialed in now.. just need to pop that motor out and drop in the spare engine, and rebuild the now broken one.. the now broken engine was donated from a 123 car that was hit pretty hard in the front, hard enough that the radiator support came back and hit the very top of the valve cover knocking a small hole in it, I carefully examined the chain and cam sprocket and ran a dial indicator on the cam sprocket to chack for a bent sprocket and everything looked fine, but I guess the crash imapct damaged it somewhere that I could not see. I probably ran the engine for about 4-5 hours before the chain broke but I had not put that much stress on the engine before. I will be putting the spare engine in and see what happens next..

dont have any performance numbers for you guys yet.. that was going to be the first attempt at top speed, she sure sounded good though.. pushing those throttles forward and the sound of a pair 617.951's turning up and the turbos spooling .. I think she will do pretty good when I get her back together

so .. everyone.. lesson here? go check your timing chain stretch and replace if nessesary, you do not want to hear the sound I heard today.. its not plesant ..

more updates (and photos) later..


cracker928 06-20-2005 10:05 PM

Ouch! Quite a setback, but it sounds as though it was one you were prepared for. I am eager to hear of the next test.

jfraley 06-25-2005 08:43 PM

well I updated the photo site with the photos from the first sea trial.. which is old news now.. the second sea-trial is when I broke the timing chain... but anyway some cool photos, and a short vid clip..

stay tuned.... more to come

jfraley 09-18-2005 08:41 AM

just an update to the forum:

have broken-chain engine out and the replacement engine sitting next to it
with overhaul complete, just need to switch components over to the good engine and re-install. I am also changing the vibration dampeners, to a different setup which is going to require a bellhousing and flywheel mods to make it fit..

have not worked on it in a while.. and I am just now getting some time, I will really try to get the updated photos on the website on monday.

midgard 09-18-2005 02:44 PM

I just cant wait... Thats my favorite engine :D

cracker928 10-12-2005 09:34 AM

Bump. :roll:

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