770 diesel in a 1550

OC4-3D · Nov 28, 2020

So it turns out my 1550 was born with a gas engine, and one of the previous owners swapped in a 770 diesel. “Pretty close to the same” but it looks like it was done in a hurry.

Hoping you guys will give me some advice regarding the radiator. It looks like it will be easier to fabri-cobble the 770 rad into the 1550 mounting, or better to try making a 1550 rad fit the 770 engine?

At the very least, I’ll need to lower the rad about 7/8” because right now the fan hits the shroud.

Dieseltech · Nov 28, 2020

I'd drill the radiator mounting holes lower..

Centerplate · Nov 28, 2020

I wonder if there is a water pump with the shaft higher up. Talk to Korves Oliver and ask Mark.

<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto64865.jpg">

<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto64866.jpg">

<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto64867.jpg">

<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto64868.jpg">[/quote]

J. Schwiebert · Nov 28, 2020

There are several water pumps for 770's and they do not all have the same center line for the shaft. Does the tractor have a Hydra-power?

J.Wondergem · Nov 28, 2020

Cut out 7/8 inch at almost to the bottom of the radiator bracket, and weld it back together.

SW3 · Nov 28, 2020

I'd re-drill the radiator mounting holes in the sides of the brackets 7/8" lower.

rustyplow · Nov 29, 2020

Do some measuring for hood clearance. I put an 880 in a 1550. Ended up using a rad from a 1600 to get it sticking up out of the hood enough.

chucksoliver77 · Nov 29, 2020

I think if you put a water pump for 1550 on it your problem will be fixed correctly. I think the pump for a 550 is the same, I measured mine and the shaft is about 1" higher than the one on my 77. The 77-1555 blocks are the same size.

770 diesel in a 1550

OC4-3D

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Dieseltech

Well-known Member

Centerplate

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J. Schwiebert

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J.Wondergem

Well-known Member

SW3

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rustyplow

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chucksoliver77

Well-known Member

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