Ok thanks for the info, now was the turbo the only upgrade to get the 270hp or was there different injector tips as well?
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Caterpillar serial number/ year model
- Thread starter Greg in KY
- Start date
Yah these one's must have all been converted, i have one here that is a 5000 serial range but it never had hydraulics on it but the guy changed the headstall and put all that on.
Old Magnet
Senior Member
No changes in nozzles, lots of internal changes...
The flywheel H.P. was increased from 160 to 180 on the D7E's, also from 235 hp to 270 hp on the D8H Tractors and 583 Pipelayers, the following engine improvements were made to effect the H.P. increase, New Crankshafts with larger diameter main and rod bearing journals, separate crankshaft gears, piston type rear oil seal, longer main bearings for added support,new rod bearing that are .5" narrower and narrower connecting rods to accommodate the narrow rod bearings, stronger cylinder blocks which are stronger in the area of the main bearing saddle struts for additional crankshaft support, it is not considered economically feasible to adapt these engine improvements to earlier tractors.
D8 Engine Bearing Dowel Change
14A, 15A, 35A, 36A1-4391, 46A1-9887 used bearing locating dowels
then changed to bearing tabs/no dowels. Center (thrust) bearings did not
use dowels and could be a problem.
Welder Dave
Senior Member
Curious how many D8H's Cinahcem has?
4, but only one running and a D6B
dozer777
Well-Known Member
bulldozer d6d commence par 4x serie 2351 at 4010 est un 1978 regardezx dans le livre serrial number guide usa
Brimmstone
Member
Old Magnet
Senior Member
5T4571 is a 1946 model D4 with D4400 engine.
Brimmstone
Member
Thats what is messing with us. All info we can find shows the D4400 to have a 4.25” bore. The engine in this machine has a 4.5” bore
Say it's not so. well now half the battle is over... Good LuckWelder Dave
Senior Member
I think you need to provide more info and/or some pics. Giving bits of info here and there makes it hard to know exactly what you have.
Old Magnet
Senior Member
It's possible the D4400 has been swapped for the later D315 (4-1/2" bore)
Get the s/n off the engine.
Get the s/n off the engine.
Brimmstone
Member
Old Magnet
Senior Member
Look for a tag LH side rear of engine just above the pony clutch housing. If tag is missing scratch around in the paint between the two rivet holes for a stamped number.
Brimmstone
Member
Came out to the tractor. The tag I posted above is the tag you are talking about. However we measured the piston bore and they 4.5” bore
Brimmstone
Member
Ok below the tractor number you can see where a tag used to be but no numbers are visible after scraping it. There was a 972 cast into the block above the tractor number tag. On the other side the block had the number 8B2746 cast into the block
Brimmstone
Member
Old Magnet
Senior Member
That is definitely a D4400 engine and was originally a 4-1/4" bore.
Seems it's been modified to accommodate 4-1/2" bore liners and pistons.
At one time there were kits available to do that.
Seems it's been modified to accommodate 4-1/2" bore liners and pistons.
At one time there were kits available to do that.
Brimmstone
Member
Old Magnet
Senior Member
Not necessarily. Stroke is the same, rods are the same center to center distance but bearings are different and wrist pin bushings are different. I'd say you'd need to dismantle to check what modifications were made.