770 diesel puller

[Trist48G]

I Inherited a 770 diesel that needs some work. I already do alittle tractor pulling with a couple 2 bangers. I know there are lots of guys running 88, 880 Oliver. Is there any way to make a 770 pull like the 880’s. Can the motors be swapped around or making internal parts fit in each other? Any easy turbo kits? Motor needs to be freshened up anyways so I’m open to anything. Thanks.

 

[Saskoliver]

I Inherited a 770 diesel that needs some work. I already do alittle tractor pulling with a couple 2 bangers. I know there are lots of guys running 88, 880 Oliver. Is there any way to make a 770 pull like the 880’s. Can the motors be swapped around or making internal parts fit in each other? Any easy turbo kits? Motor needs to be freshened up anyways so I’m open to anything. Thanks.

You can up the Engine Bore from its Current 3 1/2" to 3 3/4" with a Sleeve and Piston Kit from Korves Oliver to get Started.
The 770 Engine would still Lack a 1/4" of Stroke though as Compared to an 880 Engine. Seems to Me an 880 Engine Bolts in but the Clutch Shaft would be too Long. Can it be Shortened? Maybe. Other Option is redrilling New Engine Mount Holes in the Tub to Fit the Longer Engine, as I have Heard of a few Guys doing this. Might want to do a Search of some Past Threads on this Forum.
Either way You might ask Yourself why not Start with an 880?

 

[RCP]

What are the rules for the class you run?
The best option is probably an Oliver 310 motor.

 

[Dieseltech]

Better go with a gas 880. You will never get the fuel needed from the stock PSB pump used on early engines if that's what you have. The Stanadyne/Roosa pumps can be built for more delivery. The early energy cell head won't work nearly as well as the direct injected later engines do.

 

[tom upton]

In answer to your first question. Is there any way to make a 770 pull like the 880’s. Yes your second question .Can the motors be swapped around or making internal parts fit in each other? Yes to both. 3rd question on adding turbo. I wouldnt suggest it if you are running with other "stockish" antique tractors. All you will do is pi@@ off your competition. They will probably talk about you and not to you! One of the reasons I like tractor pulling is the social aspect of it. Ya its nice to win, but someone will always break the rules more than you do so you have to tell yourself how much money do I really want to spend just to get frowned on because you are outdoing everyone else?
If you are just pulling at local fairs and not in a sanctioned pulling class or anything a "stock" 770 diesel pulling in 4500 pounds or less should do o/k. However if its like it is around here you may want to drop a 310 in it if you want to be near the top of your class. Personally I think a 770 diesel would be a nice tractor to redo just stock. Maybe turn the pump up so it puts out some black smoke and have fun with it? We pull with a bunch of our old Olivers at the local fairs. Some are pretty much stock, and a couple we have done some work to, but nothing crazy.

 

[Trist48G]

In answer to your first question. Is there any way to make a 770 pull like the 880’s. Yes your second question .Can the motors be swapped around or making internal parts fit in each other? Yes to both. 3rd question on adding turbo. I wouldnt suggest it if you are running with other "stockish" antique tractors. All you will do is pi@@ off your competition. They will probably talk about you and not to you! One of the reasons I like tractor pulling is the social aspect of it. Ya its nice to win, but someone will always break the rules more than you do so you have to tell yourself how much money do I really want to spend just to get frowned on because you are outdoing everyone else?
If you are just pulling at local fairs and not in a sanctioned pulling class or anything a "stock" 770 diesel pulling in 4500 pounds or less should do o/k. However if it’s like it is around here you may want to drop a 310 in it if you want to be near the top of your class. Personally I think a 770 diesel would be a nice tractor to redo just stock. Maybe turn the pump up so it puts out some black smoke and have fun with it? We pull with a bunch of our old Olivers at the local fairs. Some are pretty much stock, and a couple we have done some work to, but nothing crazy.

In answer to your first question. Is there any way to make a 770 pull like the 880’s. Yes your second question .Can the motors be swapped around or making internal parts fit in each other? Yes to both. 3rd question on adding turbo. I wouldnt suggest it if you are running with other "stockish" antique tractors. All you will do is pi@@ off your competition. They will probably talk about you and not to you! One of the reasons I like tractor pulling is the social aspect of it. Ya its nice to win, but someone will always break the rules more than you do so you have to tell yourself how much money do I really want to spend just to get frowned on because you are outdoing everyone else?
If you are just pulling at local fairs and not in a sanctioned pulling class or anything a "stock" 770 diesel pulling in 4500 pounds or less should do o/k. However if it’s like it is around here you may want to drop a 310 in it if you want to be near the top of your class. Personally I think a 770 diesel would be a nice tractor to redo just stock. Maybe turn the pump up so it puts out some black smoke and have fun with it? We pull with a bunch of our old Olivers at the local fairs. Some are pretty much stock, and a couple we have done some work to, but nothing crazy.

Will a crank from a 880 diesel swap into a 770 diesel or are the main bearing journals a different size? That 1/4 inch of stoke could be easy power

 

[rrlund]

Will a crank from a 880 diesel swap into a 770 diesel or are the main bearing journals a different size? That 1/4 inch of stoke could be easy power

I believe the 880 crank might be an inch longer.

 

[Trist48G]

You can up the Engine Bore from its Current 3 1/2" to 3 3/4" with a Sleeve and Piston Kit from Korves Oliver to get Started.
The 770 Engine would still Lack a 1/4" of Stroke though as Compared to an 880 Engine. Seems to Me an 880 Engine Bolts in but the Clutch Shaft would be too Long. Can it be Shortened? Maybe. Other Option is redrilling New Engine Mount Holes in the Tub to Fit the Longer Engine, as I have Heard of a few Guys doing this. Might want to do a Search of some Past Threads on this Forum.
Either way You might ask Yourself why not Start with an 880?

Is there any machining required for the piston and sleeve kit? Or are the sleeve just thinner?

 

[dnd]

20+ years ago I purchased a 770 diesel with the Rosa master pump. Removed the engine and put in the the largest pistons and sleeves available. ??33/4? wheni had it apart I did an offset grind to the crank and used regular gas connecting rods for the extra stroke gained. One by one I installed the pistons, measured how far they were about the block deck and then machined off so that the pistons were 30 thousandths above the deck. Not to scientific but my measurements told me that the head gasket was about 60 thousandths thick. Put everything together and put engine in a 1948?? 77 with band brakes. Lighten it up so it weighed 3300 pounds without a driver. We had lots of fun with this smoking machine at 3500 and 4000 for at least a decade. People can’t believe how well it start and runs. We are no longer pulling in the local pulls but I start it up every year. I would part with this if anyone might be interested. We have a dyno and when it start to smile that’s all the HP it has after that it just smokes more.

 

[Saskoliver]

Is there any machining required for the piston and sleeve kit? Or are the sleeve just thinner?

Wall thickness is just Thinner, so They are a Direct Fit.