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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

770 diesel in a 1550

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11-28-2020 11:08:48

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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.

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11-29-2020 15:48:53

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 Re: 770 diesel in a 1550 in reply to OC4-3D, 11-28-2020 11:08:48  
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.

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11-29-2020 06:37:12

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 Re: 770 diesel in a 1550 in reply to OC4-3D, 11-28-2020 11:08:48  
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.

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11-28-2020 19:46:06

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 Re: 770 diesel in a 1550 in reply to OC4-3D, 11-28-2020 11:08:48  
I'd re-drill the radiator mounting holes in the sides of the brackets 7/8" lower.

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11-28-2020 17:16:11

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 Re: 770 diesel in a 1550 in reply to OC4-3D, 11-28-2020 11:08:48  
Cut out 7/8 inch at almost to the bottom of the radiator bracket, and weld it back together.

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11-28-2020 15:53:04

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 Re: 770 diesel in a 1550 in reply to OC4-3D, 11-28-2020 11:08:48  
I wonder if there is a water pump with the shaft higher up. Talk to Korves Oliver and ask Mark.

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J. Schwiebert

11-28-2020 17:14:33

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 Re: 770 diesel in a 1550 in reply to Centerplate, 11-28-2020 15:53:04  
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?

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11-28-2020 14:04:10

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 Re: 770 diesel in a 1550 in reply to OC4-3D, 11-28-2020 11:08:48  
I'd drill the radiator mounting holes lower..

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