Licensed to kill Posted July 18, 2021 Share Posted July 18, 2021 I have an oil leak that appears to be from on of the side plates on the block behind the injection pump. The pump will need to be removed to get to it. What is the procedure for removing the pump and reinstalling it without messing up the timing?. Engine is a 1981 E6-350 2 valve. Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/ Share on other sites More sharing options...
mrsmackpaul Posted July 18, 2021 Share Posted July 18, 2021 I believe that it should be master keyed so can only go in one way Once this is done it will need to spill timed, this is a two person job and you really need to find someone who has done this, not been smart or rude or any other such thing but it needs to be right I doubt even most heavy diesel mechanics know how to do this properly However your local diesel injection place probably can supply the second person and they can talk you thru it to and help you get it right I have done it before but I am not confident enough to be giving instructions here Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477061 Share on other sites More sharing options...
theakerstwo Posted July 18, 2021 Share Posted July 18, 2021 Show us a photo of the pump being there could be two different pumps used. 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477072 Share on other sites More sharing options...
D-Day Posted July 18, 2021 Share Posted July 18, 2021 and if it has the extravagance timing device the procedure for disassembly and assembly is different Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477078 Share on other sites More sharing options...
D-Day Posted July 18, 2021 Share Posted July 18, 2021 extravance timing dam spell check Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477079 Share on other sites More sharing options...
Licensed to kill Posted July 19, 2021 Author Share Posted July 19, 2021 Not sure what kind of pictures but here are a few. If more are required just let me know what angles are needed. Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477084 Share on other sites More sharing options...
Popular Post 67RModel Posted July 19, 2021 Popular Post Share Posted July 19, 2021 That looks like an American Bosch pump. Removal is very strait forward. Disconnect all linkages and lines then just unbolt it from the front cover / timing gears. There should be a support underneath pump that supports the back end of it. The two bolts a real bear to access. In my opinion that is the hardest part of the job...removing and reinstalling these support bolts. Once it is unbolted it just slides out of the timing gears and lifts out. A real back breaker. It is a lot harder when it is the engine is in the truck and you are leaning over a frame rail to get to everything. It can only be installed the correct way or 180 degrees from the correct way so as long as you dont move the truck (or rotate the engine in this case) while the pump is out you will not loose the timing. There is machined metal puck that couples the pump to the timing gears much like the rubber part of a lovejoy coupler. It will fall out when you take remove the pump so be ready to catch it. The gasket to reseal the pump to the engine is still readily available from the Mack parts counter for about $12. I will look in my records to see if I can find a part number. 1 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477090 Share on other sites More sharing options...
fjh Posted July 19, 2021 Share Posted July 19, 2021 (edited) 2 hours ago, 67RModel said: That looks like an American Bosch pump. Removal is very strait forward. Disconnect all linkages and lines then just unbolt it from the front cover / timing gears. There should be a support underneath pump that supports the back end of it. The two bolts a real bear to access. In my opinion that is the hardest part of the job...removing and reinstalling these support bolts. Once it is unbolted it just slides out of the timing gears and lifts out. A real back breaker. It is a lot harder when it is the engine is in the truck and you are leaning over a frame rail to get to everything. It can only be installed the correct way or 180 degrees from the correct way so as long as you dont move the truck (or rotate the engine in this case) while the pump is out you will not loose the timing. There is machined metal puck that couples the pump to the timing gears much like the rubber part of a lovejoy coupler. It will fall out when you take remove the pump so be ready to catch it. The gasket to reseal the pump to the engine is still readily available from the Mack parts counter for about $12. I will look in my records to see if I can find a part number. I believe that pump is the splined drive similar to the compressor drive ! except it is doweled and the pump can only go on one way! one spline is cut away to allow for the dowel to time the pump! ( NOTE if you haven't done this already !) While the pump is off Replace that coolant hose compressor to the water pump It is a PIA to do after the pump is on! Just sayin! Edited July 19, 2021 by fjh 2 Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477093 Share on other sites More sharing options...
Licensed to kill Posted July 19, 2021 Author Share Posted July 19, 2021 So, just to be sure, just remove the three bolts that bolt the pump to the cover, remove the rear support and pull it out? (after all lines and linkages etc are removed of course). Replacing the coolant hose while the pump is off is sound advice. I already did replace that coolant hose and yes it was a PITA. Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477098 Share on other sites More sharing options...
67RModel Posted July 19, 2021 Share Posted July 19, 2021 6 minutes ago, Licensed to kill said: So, just to be sure, just remove the three bolts that bolt the pump to the cover, remove the rear support and pull it out? Yes. When you pull the pump away that machined/keyed coupler will fall out. Once you see it you will understand. It only goes back together one way. Just don't spin the engine while the pump is off. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477099 Share on other sites More sharing options...
Steve L Posted July 21, 2021 Share Posted July 21, 2021 (edited) If you don’t move the engine while the pump is off it will go back on and the timing stays the same. You will see the adapter which prolly will fall out, the adapter has 4 square notches and one small dowel pin. This pin coincides with drilled holes in the pump and drive gear, can’t go back wrong. BTW, nice looking engine. Edited July 21, 2021 by Steve L 2 Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477176 Share on other sites More sharing options...
mrsmackpaul Posted July 22, 2021 Share Posted July 22, 2021 Not exactly the same, there is some degree of movement in the bolt holes, it is always best to spill time it as you have no idea if it was right before hand Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/67409-removing-injection-pump/#findComment-477215 Share on other sites More sharing options...
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