Hello, I'm new to this forum and I hope someone out there can help me. I have a D318 Marine in an old boat that I'm restoring. In my efforts to aquire some spare parts I have located a D318 that came out of a crane, and I need to know if parts like the head, crank, injection pump ect. are the same.
If it helps the serial # on my engine is 6V26 and the crane engine is 5V17573.
Mine is rated at 80hp @ 1600 rpm and the other is 75hp@ 1200 rpm.

Most all the bolt on parts will interchange.
There is a difference in the governor groups, rack settings and gov spring.
My rack setting manual does not correlate exactly to your specs.
For the 5V @ 1200 rpm I show 72hp rated.
Gov. group #3L7143
Spring #1H9257
Rack setting of 0.180 (add 0.020 if not cam ground pistons)

For the 6V @ 1600 rpm I show 95hp rated
Gov. group #5F5659
Spring #5F1940
Rack setting 0.135 (add 0.020 if not cam ground pistons)

My manuals list shows I have a 5V parts book but at the moment I can't find it:(

I have a master parts catalog on the marine model and it would be great to compare the part numbers in the 5V catalog if you could find it. I want to get, or have made, a pulley to mount to the end of the crank to drive a high output alternator, but I'm not sure if the ends of the cranks are the same. I also would like to know if the oil pan is different on the marine model. Mine has some heavy corrosion from exposure to salt water. I know there goverened differently but would the injection pump be the same?

I'll keep looking for the manual but I'm pretty sure the cranks are the same.
Injection pumps would be the same.
I think your in luck on the pans. The industrial engines used a two sump (forward & centered) and a double gear oil pump, check your marine parts manual, for same. Tractors used a triple gear pump with a three sump system.

Have you looked at the two groove pulleys that became standard on the later D318's in the D6 tractor. 1M3608 belt tightener group (field installation) with 1M2047 crankshaft pulley, 5M9035 waterpump pulley etc.

What do you have running on the crankshaft pulley as it is now? Water pump like all the other engines? Without a fan on the hub, a single belt would run the waterpump fine, leaving a B width belt to run the alternator. Or you could mount the alternator to tighten both belts instead of the standard tightener idler pulley.

Here's a picture of the marine engine.
Those double v-belt pulley setups for the late D318 are pretty rare attachments.
Would like to have that setup myself.

Might be possible to take an old single groove one and machine it down to a hub that would accept a taper lock type pulley of whatever type you desire.

Not to confuse anyone but as OM said some engines have two part pumps & some three but they only use the main center pump for pressure & the other ones pump oil or scavange it back to the main sump so it doesn,t starve for oil esp. if the engine is tipped one way or the other and the oil accumulates in the scavange sump and drainage too from the engine parts on the ends.

D318 Marine,
Well, I turned the place upside down and can't find the 5V parts book.....must be going blind;) .....I'm sure it will show up eventually.

CCjersey,
Will look into the taper lock option but I need another project like a hole in the head;) The water pump drive might be a bit of a challenge. Was hoping to find some original stuff but chances of getting the specific one with the idler/adjuster and fan hub for the blower fan application makes it even more challenging.

OM,
D318 Marine's task of belting up an alternator is pretty simple compared to the whole nine yards you are looking at.

Just for grins, I tried a crankshaft pulley off a D333 (D6B44A) on the snout of a D318 crank and it doesn't do half bad. Only goes on about 2/3 of the depth of the hub though. Looks like some machine work to slightly enlarge the bore and maybe add a keyway, if wanted, would result in a good installation with plenty of clearance behind the pulley. Also may be possible to just bore a taper lock pulley to fit the shaft nose if it won't fit by itself. I can try a few different styles on the D318 crank sometime just to see what looks good.