Yanmar Maring Diesel Engine Disassembly of Fuel Injection Pump Guide

  Yanmar 3JH2 Series  Maring Diesel Engine Disassembly of fuel injection pump guide  

 

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 When disassembling the fuel pump, separate the parts for each cylinder and be careful not to get them mixed up.
Be especially careful to keep the plunger/plunger barrel, delivery valve/delivery valve seat and other assemblies separate for each cylinder (the parts of each assembly must be kept with that assembly and put back in the same cylinder).
Preparation
1. Wash off the dirt and grease on the outside of thepump with cleaning oil(kerosene or diesel oil) before disassembly.
2. Perform work in a clean area.
3. Take off the fuel pump bottom cover and remove lubri.
   cant oil.
4. Turn the fuel pump upside down to drain fuel oil.

(1)Loosen the nut with a box spanner and take it off, holding it with the hole in the fuel coupling ring or holding the coupling with a vise and take out the governor weight assembly.

(2) Remove the fuel feed pump.
NOTE: Do not disassemble the fuel feed pump. See in-
structions for fuel feed pump for details.

(3) Remove the fuel pump side cover.

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(4) Turn the camshaft until the roller guide is at themaximurm head, and insert the plunger spring support plate in between the plunger spring washer B lower side) and fuel pump unit.

NOTE: If the camshaft does not turn, put double nuts on the end of the cam shaft or remove the coupling.
(5) Remove the camshaft wood ruff key.
(6) Put a screwdriver in the two grooves on the camshaft bearing holder mounting surface, and pull out the cam-
shaft bearing hotder.

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NOTE:
1.Be sure not to damage the oil seal with the threaded part of the camshaft.
2.Be careful not to loosen the shims in between the pump and bearing holder.
  Printed in Japan A0A1015-9110SP


(7) Turn the fuel pump upside down, move all the roller guides to the plunger side, and then put the pump on its side. Turn the camshaft to a position so that none of the cylinder cams hit the tappets.
(8) Put a plate against the governor end side of the cam-
shaft and lightly tap it, and pull out the camshaft and drive side bearing.

(9) Remove the roller guide stop.

(10) Use a hammer handle or the like to push up the roller guide from the bottom of the pump, and remove the plunger spring support plate.

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NOTE: The plunger spring may make the roller guide and plunger, etc. fly out when the plunger support plate is removed.


(11) Remove the roller guide.

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NOTE: When you stand the fuel pump up, all of the roller guides drop out at one time. Therefore, first remove the stop bolt for one cylinder at a time, and then the roller guide for each cylinder-continue this process.

(12) Remove the plunger, plunger spring and lower washer from the lower part of the pump.

NOTE:Keep the parts separate for each cylinder.

(13) Loosen the small screw on control pinion.

NOTE:1. Check to make sure the match marks on the pinionlsleeve are correct before loosening the small screw on the control pinion, as the pinion and sleeve come apart when the screw is loosened. If the mark is hard to read or off center, lightly inscribe a new mark. This will serve as a guide when adjusting injection volume later.

(14) Remove the control pinion, sleeve and upper rest.


NOTE:
Keep parts separate for each cylinder.


(15) Remove the con: rol rack stop boit and remove the rack.

NOTE:Be careful not to lose the spring or rest on the control rack.

(16) Loosen the delivery valve retainer stop bolt, and remove the dellvery valve hoider stop.

(17) Remove the delivery valve holder.

(18) Remove the delivery valve assembly.

NOTE:1. Be careful not to lose the delivery valve pack-
ing. delivery valve spring, delivery valve stopper or other small parts.
2. Keep the delivery vave assemblies for each cylinder clearly separated.
(19) Take the plunger barel out from the top of pump.

NOTE:Keep it as a set with the plunger that was remo.
ed earlier