Lucas CAV Pump Adjustment
07-13-2012, 07:01 AM
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Lucas CAV Pump Adjustment
We have a 4270 Perkins Diesel out of a older Cockshutt tractor with a CAV pump. The owner is having it solely for a pulling tractor so excessive tweaking isn't a worry... at least not to this guy
. I've found very little guidance as far as what exactly to adjust so I need some expert opinions from any old gurus.
Mike
. I've found very little guidance as far as what exactly to adjust so I need some expert opinions from any old gurus.Mike
07-16-2012, 11:31 PM
#3
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Found this while digging through my C drive.
1.Here is the injector pump we will be working on. The fuel cover plate is in the middle of the injection pump, and has two bolts that are on a slant, holding it on
2. Shut off fuel feed from tank. The valve is assessable from the rear of the tractor, on the left side, at the bottom of the tank.
3. Using an 8mm wrench, remove the fuel cover plate. Be careful to not tear the rubber gasket behind it. Fuel will pour out of the injection pump until it is empty. Looking inside the injector pump, you will see a thick disc with letters stamped on it, spaced out around the outer edge. You will also see the two bolts that hold it in place.
4.You will need to rotate the engine by hand, in order to access one bolt at a time. Remove the first bolt with an 8mm wrench (they are very tight) and use needle nose pliers to draw the bolt out of the injection pump. DO NOT drop the bolt in the injection pump, or you will have to fish it out with a magnet, and it's very hard to do.
5.Rotate engine by hand to gain access to the other bolt and remove it with an 8mm wrench. You may need to use a small screw driver to hold the thick plate up, so that you can remove the second bolt, as it continues to loosen out.
6. Look up above the thick plate, after it has dropped down the splined shaft, you will see a thin plate with four large slots in it, and two holes for the bolts to go through.
7. Viewed from the top of the injection pump (opposite of driven end) rotate the plate with a screwdriver clockwise. You have to do full turns because the bolt holes in the plate have to line back up.
8. Reinstall bolts one at a time. You will need to use a screwdriver to push up on the bolt, and use needle nose pliers to screw it in at the same time. Tighten one bolt down tight, then turn engine over by hand to access other hole. Reinstall and tighten second bolt.
9. Rotate engine over by hand again, and double check tightness of bolts.
10. Reinstall rubber gasket and fuel cover plate, along with the two 8mm bolts.
11. Using a 16mm wrench, crack all of the injector lines on the top of the injection pump open.
12. Open fuel shut off valve on bottom of fuel tank.
13. Bleed air from injection pump by cranking engine over until fuel shoots out of fittings.
14. Tighten fittings back up and start engine. Enjoy your new found power.
I have read, that opening up the exhaust on this T6.3544CC Perkins engine and turning the fuel up one full turn, will give you an additional 30 hp. It was also recommended, to not go more than two full turns up on the injector pump if the engine has more than 5000 hours on it. I assume this is because as the injectors wear, they allow more fuel in at the wrong time. So if you keep your injectors good, you can turn it up more, but I would recommend a pyrometer if you want to do this.
This was posted by another fellow, on the great lakes coal rollers site. I found it about a year ago, when working on a perkins in a Massey tractor. The instructions seemed a little dicey at first, although well written, and if you are looking at the pump, it makes perfect sense.
Up til last summer, it had been the better part of 20 years, since I last worked on a Lucas pump. Funny, I didn't miss them one bit.
Good luck with it.
1.Here is the injector pump we will be working on. The fuel cover plate is in the middle of the injection pump, and has two bolts that are on a slant, holding it on
2. Shut off fuel feed from tank. The valve is assessable from the rear of the tractor, on the left side, at the bottom of the tank.
3. Using an 8mm wrench, remove the fuel cover plate. Be careful to not tear the rubber gasket behind it. Fuel will pour out of the injection pump until it is empty. Looking inside the injector pump, you will see a thick disc with letters stamped on it, spaced out around the outer edge. You will also see the two bolts that hold it in place.
4.You will need to rotate the engine by hand, in order to access one bolt at a time. Remove the first bolt with an 8mm wrench (they are very tight) and use needle nose pliers to draw the bolt out of the injection pump. DO NOT drop the bolt in the injection pump, or you will have to fish it out with a magnet, and it's very hard to do.
5.Rotate engine by hand to gain access to the other bolt and remove it with an 8mm wrench. You may need to use a small screw driver to hold the thick plate up, so that you can remove the second bolt, as it continues to loosen out.
6. Look up above the thick plate, after it has dropped down the splined shaft, you will see a thin plate with four large slots in it, and two holes for the bolts to go through.
7. Viewed from the top of the injection pump (opposite of driven end) rotate the plate with a screwdriver clockwise. You have to do full turns because the bolt holes in the plate have to line back up.
8. Reinstall bolts one at a time. You will need to use a screwdriver to push up on the bolt, and use needle nose pliers to screw it in at the same time. Tighten one bolt down tight, then turn engine over by hand to access other hole. Reinstall and tighten second bolt.
9. Rotate engine over by hand again, and double check tightness of bolts.
10. Reinstall rubber gasket and fuel cover plate, along with the two 8mm bolts.
11. Using a 16mm wrench, crack all of the injector lines on the top of the injection pump open.
12. Open fuel shut off valve on bottom of fuel tank.
13. Bleed air from injection pump by cranking engine over until fuel shoots out of fittings.
14. Tighten fittings back up and start engine. Enjoy your new found power.
I have read, that opening up the exhaust on this T6.3544CC Perkins engine and turning the fuel up one full turn, will give you an additional 30 hp. It was also recommended, to not go more than two full turns up on the injector pump if the engine has more than 5000 hours on it. I assume this is because as the injectors wear, they allow more fuel in at the wrong time. So if you keep your injectors good, you can turn it up more, but I would recommend a pyrometer if you want to do this.
This was posted by another fellow, on the great lakes coal rollers site. I found it about a year ago, when working on a perkins in a Massey tractor. The instructions seemed a little dicey at first, although well written, and if you are looking at the pump, it makes perfect sense.
Up til last summer, it had been the better part of 20 years, since I last worked on a Lucas pump. Funny, I didn't miss them one bit.
Good luck with it.
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