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Model? MD6 and MD7 shop manuals and operators manuals can be found online. I can only suggest basic things that you probably already know. Replace anything replaceable. Drain all fluids and replace with new. This especially includes the fuel. Stuff can grow in diesel and diesels are finicky about fuel. Make sure the tank is clean and the fuel is fresh. The fuel system will need to be primed to remove air after filters replaced and fuel replaced. Other than that, details of engine and symptoms will probably be required to get better responses from the experts.
I did check the oil, and it looks good, black as hell, but no water marks. I changed the belts as well. Just waiting on the batteries to finish charging
If those batteries, like the engine, have been sitting around for a few years, they probably aren't going to hold much of a charge now. Batteries generally don't tolerate sitting uncharged.
I've recently purchased a Tanzer 28 as a project boat and the deisel has not been started in approx. 4 years. She has a single cyl. volvo penta. I have been basically told the same thing. Hopefully next week I will drain the old fuel out, add fresh fuel, bleed the system and try to fire her up. I have turned her over briefly with the starter. Good luck with yours and keep use updated.
Open the compression release & try to turn the motor over by hand very slowly. Use the manaul crank or a socket @ the fly wheel. Be very careful, you are not trying to start the motor, you just want to see if it'll turn & go thru a compresion cycle. Be sure the fuel feed cut off is pulled in the out position before attempting this & pay attention to where your body parts are.
If the motor turn over, take the air cleaner off, spray WD40 in the intake, close the compression release, open the fuel & hit the switch.
Whoa! Easy there guys! don't be so quick to spray "starting aids" into the engine. That should be a last resort because they can be very hard on the engine!
If the engine has compression and fuel, it should start without spraying anything into the air intake!
More than likely that the engine will run just fine, those old Volvos seem to last forever. The transmissions also last a long time but sooner or later the clutch cone wears out and parts are not available any longer. My father replaced his 1970 Volvo for that reason, the engine ran fine but the trans. failed.
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