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Re: MH33/44 Injection Pump

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Author  [Modern View]

04-25-2013 12:22:20

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With hub mark aligned with pointer the head marked tooth will be one tooth past the housing mark when head is installed correctly. Head is installed with tappet at base circle of cam lobe, just starting to lift the tappet. When hub mark and pointer line up tappet has started up the cam ramp. this will be port closing, begining of injection. My IT MH book shows it wrong, but my IT Oliver 77, 88, 99 has it right.

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04-25-2013 12:42:06

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 Re: MH33/44 Injection Pump in reply to Dieseltech, 04-25-2013 12:22:20  
Forgot to mention, changing head drive gear tooth position will NOT change the timing, hub mark to flywheel does. Moving head gear controls port alignment to correct cylinder injector. Make sure the head plunger drive in the gear is good. If cracked or broken cylinder phase timing will be off far enough to keep it from running.

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04-25-2013 13:03:14

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 Re: MH33/44 Injection Pump in reply to Dieseltech, 04-25-2013 12:42:06  
Interesting... It appears to run OK with the head gear off one tooth. there must be enough of a plunger/port overlap to still allow the nozzles to work properly. Nuts. I'll have to pull the pump (again!) to reposition the quill shaft. I'll let you know how it turns out in the end. Thanks!

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04-25-2013 19:14:10

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 Re: MH33/44 Injection Pump in reply to MFJohn, 04-25-2013 13:03:14  
Just pull the head and move the drive gear one tooth. Head and quill shaft are installed at same cam location, with tappet just beginning to start up ramp but still on base circle. This is when quill gear cutout should be to install head with tooth notch lined with housing mark. Even if quill is in wrong, find where head will lift out and move one tooth. No need to remove complete pump.

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06-18-2013 04:31:32

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 Re: MH33/44 Injection Pump in reply to Dieseltech, 04-25-2013 19:14:10  
If I just pull the head to change the timing, I can fix the quill shaft to head timing, but then the pump to engine timing will be incorrect (as indicated by the timing line and pointer). I pulled the pump and corrected the quill shaft to head timing. Now all the timing marks will line up like you said. After reassembly, the engine seems to run the same as before the change, but it"s probably easier on the pump to have the port opening correctly synced with the plunger stroke. Thanks for your help.

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