Marks481
Platinum Member
- Joined
- May 29, 2005
- Messages
- 978
- Tractor
- Power Trac 422 (2005)
I just want to say "you are my hero!"
Also, I want to say "THIS THREAD IS WORTHLESS WITHOUT PICTURE!"
Please?
pt 425 engine alternatives
- Thread starter scotts562
- Start date
- Views: 18097
I just want to say "you are my hero!"
Also, I want to say "THIS THREAD IS WORTHLESS WITHOUT PICTURE!"
Please?
agjones
Platinum Member
- Joined
- May 4, 2010
- Messages
- 618
- Location
- Jessup Mill, NC
- Tractor
- Rk55HC, Kubota kx040, power-trac 425d, Bobcat L23, Yanmar 401w, bx1880, IHI 30 and Fiori D40 dumpers, Magnatrac mh5000, Dew-eze ATM72LC Slope Mower, Terramite t6 4wd, DR Power brush mower
Alright, these pictures look like a crime scene, but they'll have to do. I'd just brought the machine in from a very dusty job and decided the engine cover had to go.
The pt425 looks like a dusty train wreck. Here's some notes on what you are looking at.
I'm ditching the steel engine cover, that thing is both useless and killing me....pretty sure the dirt intake with the RObin contributed to it's death. So, I went to metalscut4u.com and ordered three aluminum cuts to enclose the sides and top/front. that can replace the heavy burdensome cage. They'll laser cut in the circle for the fan and the oil cooler will mount just like it used to. With the radiator fan sucking in lots of air and the oil cooling fan expelling lots of air...and the cooler diesel...not to mention adequately sized and positioned exhaust...I'm not real worried about heat. I'll have space to mount the air filter safely inside the housing and that will also reduce the intake of junk.
I've got a baffle/heat wall that will mount between the exhaust and battery....I'm thinking it will be fixed to the sides like the new back of the cover (gray w/ lights in pics) The top of the cover will lift on a hinge in the same motion the original one did....but without weighing in at a sketchy 90#.
The final routing of the muffler 90 down and out the back. That mass of wiring is from the Jacobsen donor machine...It will get cleaned up and the ignition installed under the cover. Check the oil, check the fuel...turn the key. No more snagging keys up front (I work in some pretty hairy conditions) and no starting fires with that PT muffler. The existing throttle and choke cables worked just fine, in fact, they reached perfectly to handle throttle and Kill(instead of choke).
The new hydraulic cylinder valves are next to the stick for the loader, one will handle grapple duty the other will see action on a forthcoming rear 3pt or similar....I can reach them all with one hand while running the loader stick...how convenient.
Other than the radiator sticking out 2" past the end of the tub steel and the engine cover...which was handled unceremoniously with the reciprocating saw....The only accommodation the kubota d662 (or d772) required were 4 6" .25 thick engine mounts. 90 degree bend in the last inch on one end 3/8 bolt holes both ends. With the mounts and a new bellhousing from Hayes to join the flywheel to the pump...bam. Water cooled diesel PT425. The oil drain on the bottom of the engine lined up perfectly so my 19mm wrench can slip in and spill her guts.
Bellhousing $350, Kubota donor engine $500 <--that was unbelievable. Replacing the cover with Aluminum, $300. The cover replacement had nothing to do with the engine swap. I could have just built the back out 2.5" and called it a day...but as you likely gather, I hated that cover from day one...it weighs almost as much as me.
I'll post pics once cleaned up and dressed in the new cover. Oh and if there was a middle finger emoticon...I'd aim it squarely at Robin Subaru.
The pt425 looks like a dusty train wreck. Here's some notes on what you are looking at.
I'm ditching the steel engine cover, that thing is both useless and killing me....pretty sure the dirt intake with the RObin contributed to it's death. So, I went to metalscut4u.com and ordered three aluminum cuts to enclose the sides and top/front. that can replace the heavy burdensome cage. They'll laser cut in the circle for the fan and the oil cooler will mount just like it used to. With the radiator fan sucking in lots of air and the oil cooling fan expelling lots of air...and the cooler diesel...not to mention adequately sized and positioned exhaust...I'm not real worried about heat. I'll have space to mount the air filter safely inside the housing and that will also reduce the intake of junk.
I've got a baffle/heat wall that will mount between the exhaust and battery....I'm thinking it will be fixed to the sides like the new back of the cover (gray w/ lights in pics) The top of the cover will lift on a hinge in the same motion the original one did....but without weighing in at a sketchy 90#.
The final routing of the muffler 90 down and out the back. That mass of wiring is from the Jacobsen donor machine...It will get cleaned up and the ignition installed under the cover. Check the oil, check the fuel...turn the key. No more snagging keys up front (I work in some pretty hairy conditions) and no starting fires with that PT muffler. The existing throttle and choke cables worked just fine, in fact, they reached perfectly to handle throttle and Kill(instead of choke).
The new hydraulic cylinder valves are next to the stick for the loader, one will handle grapple duty the other will see action on a forthcoming rear 3pt or similar....I can reach them all with one hand while running the loader stick...how convenient.
Other than the radiator sticking out 2" past the end of the tub steel and the engine cover...which was handled unceremoniously with the reciprocating saw....The only accommodation the kubota d662 (or d772) required were 4 6" .25 thick engine mounts. 90 degree bend in the last inch on one end 3/8 bolt holes both ends. With the mounts and a new bellhousing from Hayes to join the flywheel to the pump...bam. Water cooled diesel PT425. The oil drain on the bottom of the engine lined up perfectly so my 19mm wrench can slip in and spill her guts.
Bellhousing $350, Kubota donor engine $500 <--that was unbelievable. Replacing the cover with Aluminum, $300. The cover replacement had nothing to do with the engine swap. I could have just built the back out 2.5" and called it a day...but as you likely gather, I hated that cover from day one...it weighs almost as much as me.
I'll post pics once cleaned up and dressed in the new cover. Oh and if there was a middle finger emoticon...I'd aim it squarely at Robin Subaru.
Last edited:
Marks481
Platinum Member
- Joined
- May 29, 2005
- Messages
- 978
- Tractor
- Power Trac 422 (2005)
That is thinking outside the box!
Nice work.
Probably not a power hit from my 22 hp robin, but I really want to step up a few hp, not stay here. Field mowing with the 22 hp takes longer then it should.
MossRoad
Super Moderator
- Joined
- Aug 31, 2001
- Messages
- 57,929
- Location
- South Bend, Indiana (near)
- Tractor
- Power Trac PT425 2001 Model Year
bumping this thread back up to the top...
I finally got around to pulling the hydraulic pump out of my 425. Dragging my feet on this project has paid off.
As you may already know, the Robin EH72 engine has been discontinued. Power Trac now sells a conversion kit that allows you to drop in a Kohler CH730-3208 engine.
The kit costs about $300 and includes muffler with gaskets, heat shield, new mounting spacers with bolts, a fuel elbow, an oil drain elbow, pump adapter, and a pre-punched steel plate to convert the existing mounting plate in the tub of the machine. I have included a picture of the kit below.
The existing pump adapter on a Robin engine will not work because the engine side pilot (ie the flat part inside of the outer rim) of the adaptor is only 6 1/2" instead of 7".
As it turns out, my machine is one of about ten that was build with a spline connector between the engine and pump. Seeing how much heavier built mine is, I feel I got lucky. I have attached pictures of my pump adapter/spline connector next to the standard love joy style. Mine is on the right. The round housing portion of my adapter measures 4 1/2" across vs 3 1/2" across for the standard style. In addition, the ears to which the pump bolts to are 1" across vs 3/4" across on the standard style. The guys at Power Trac said they have sold 3 or 4 conversion kits so far and will now ask people to confirm which connector they have between the engine and pump. They happened to have an adapter for my connection style on the shelf and are sending it my way.
The other differences I see in the parts I received vs what I have is that the heat shield is about 1 1/2" taller and the pipe spacers used to mount the engine to the machine are about 1" deep.
The engine is on order and the pump is in the shop. I will snap a few photos when I start putting things back together.
As you may already know, the Robin EH72 engine has been discontinued. Power Trac now sells a conversion kit that allows you to drop in a Kohler CH730-3208 engine.
The kit costs about $300 and includes muffler with gaskets, heat shield, new mounting spacers with bolts, a fuel elbow, an oil drain elbow, pump adapter, and a pre-punched steel plate to convert the existing mounting plate in the tub of the machine. I have included a picture of the kit below.
The existing pump adapter on a Robin engine will not work because the engine side pilot (ie the flat part inside of the outer rim) of the adaptor is only 6 1/2" instead of 7".
As it turns out, my machine is one of about ten that was build with a spline connector between the engine and pump. Seeing how much heavier built mine is, I feel I got lucky. I have attached pictures of my pump adapter/spline connector next to the standard love joy style. Mine is on the right. The round housing portion of my adapter measures 4 1/2" across vs 3 1/2" across for the standard style. In addition, the ears to which the pump bolts to are 1" across vs 3/4" across on the standard style. The guys at Power Trac said they have sold 3 or 4 conversion kits so far and will now ask people to confirm which connector they have between the engine and pump. They happened to have an adapter for my connection style on the shelf and are sending it my way.
The other differences I see in the parts I received vs what I have is that the heat shield is about 1 1/2" taller and the pipe spacers used to mount the engine to the machine are about 1" deep.
The engine is on order and the pump is in the shop. I will snap a few photos when I start putting things back together.
Attachments
MossRoad
Super Moderator
- Joined
- Aug 31, 2001
- Messages
- 57,929
- Location
- South Bend, Indiana (near)
- Tractor
- Power Trac PT425 2001 Model Year
Wow! That's a good price for the kit. Where did you end up getting the new engine?
MossRoad
Super Moderator
- Joined
- Aug 31, 2001
- Messages
- 57,929
- Location
- South Bend, Indiana (near)
- Tractor
- Power Trac PT425 2001 Model Year
That's a good price. :thumbsup:
BobRip
Elite Member
This is good news. Please take a lot of pictures. My engine needs oil added every one to two hours. Spark plugs get fouled every couple months.
MuncyBob
Platinum Member
I hoped that by now PT would not be using 90 degree elbow in the exhaust!
