605 diesel engine

[MDWK40]

My 15 year old son just bought a GB diesel and he has a vision. I have a HD605 and he would like to bolt his diesel heads on and convert it to a diesel. I know some head bolt holes have to be drilled, and my 605 has the webbed jugs. has anyone ever tryed this swap? Thanks.

 

[mm585]

Isnt anyone going to reply? Ive often thought about this conversion also. Can it be done?

 

[Dieselbear]

You can make one bigger than that, but not that combo

 

[LW]

I think a HD 800 bottom and 5.400 bore cat pistons would be a great combo to do this and keep the compression in line.

 

[mm585]

I forgot to mention he cant run any HD800 parts. I think he could get away with an early 800 lower end and jugs though. this tractor will be pulled in the clasic classes at 10% over factory high idle. Is there enouff cast in the top of the early 800 jugs to drill and put in the missing studs? I did get a roosa master pump and drive today but no lines. Im starting to think a 585 with the small bell from a gb gas may be the way to go. Then rework a gas flywheel?? I dont know.

 

[mm585]

I forgot to mention he cant run any HD800 parts. I think he could get away with an early 800 lower end and jugs though. this tractor will be pulled in the clasic classes at 10% over factory high idle. Is there enouff cast in the top of the early 800 jugs to drill and put in the missing studs? I did get a roosa master pump and drive today but no lines. Im starting to think a 585 with the small bell from a gb gas may be the way to go. Then rework a gas flywheel?? I dont know.

 

[LW]

Then just put a 605HD crank in a 504dhd. Use a differtent rod and piston, get up to 650-675 cid fairly easy.

 

[minnmoman]

U might want to research, 605 crank ,off set grind ,, add alitttle stroke, newer m.m. Rods cummins pistons, taper the rods at the top, regrind cam , or go with a newer cam, cam grinds are a little better , look at the heads gb heads might be little tighter on compression ..maybe look for newer heads flow .more air,, gotta run a rosamaster pump run ,big head on it ,can go bigger. Pistons, may cost ya some, but will work,,jus my too cents

 

[mightymolinekid]

minnmoman has lots of good ideas, just ask his parts yard in Wisconsin. How about Cat pistons? Those are 4.75". With a 605 crank you got 640 CID and you can run the short jugs on your original GBD crankcase. Yes go with the Roosa-Master pump, you will get way more fuel out of that than you can from the Bosch.

 

[minnmoman]

Lol , i fergot my other too cents,,, 605 rods bearing, might be smaller, but a small obstical, can be easliy, remadey, if ya not a cummins man ,, i think kittycat piston is a ultamit,, ya might check into sprayin oil to up under those kittys lol.. It be tuff puller,,

 

[mm585]

Will we be able to safley bore the jugs to 4.75 on a diesel? If it were a gas enginge I wouldent bat an eye, but the detonation and compresion of a diesel makes me nervous. The reason I ask is because a few years ago I bought a set of 4.75 M&w pistons that the previous owner milled the dome off and had ran them in a 5 star diesel and he cracked two cylinder walls. We have the webed jugs Im not sure what he had.

 

[mightymolinekid]

Yes just make sure you use jugs from a newer 504 or 336 diesel. Sleeves will easily fix cracked cylinder walls lol. I'm running a 4.75" bore diesel 4 cylinder.