Construction and other equipment - Injector timing for a AC 7000 344ci

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Injector timing for a AC 7000 344ci

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=71398
Printed Date: 27 Jun 2025 at 7:28pm
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Topic: Injector timing for a AC 7000 344ci

Posted By: mahto48
Subject: Injector timing for a AC 7000 344ci
Date Posted: 05 Jun 2013 at 2:52pm

I need to know what the injector pump timing is for a 7000 344 ci motor. I know the earlier 344 Buda was 28 degrees before top dead center and then it was changed to 30 degrees on later 344s. I am using a HD 344 buda flywheel on this 7000 and I am not sure where to set it as the head is different so I can't get in with a feeler gauge to set the #1 piston and remark the fly wheel. Any suggestions?

Replies:

Posted By: Ian Beale
Date Posted: 05 Jun 2013 at 4:01pm

Mahto48

I don't have access to a HD 11 manual that covered the full series just now, but I recall that had a section on re-marking flywheels.

So I'd suspect something the same in those for 344's that cover their full series.

Posted By: Mactractor
Date Posted: 05 Jun 2013 at 5:27pm

I think the books stated 28 degrees for crawler tractor application of 6000 and 7000 engines, and 32 degrees when fitted to tracked loaders, wheeled loaders, and graders which were delivering a little more fuel for their higher power ratings

Posted By: Ian Beale
Date Posted: 06 Jun 2013 at 1:00am

Some notes I took from that HD 11 manual while trying to sort out our AC 45 grader

HD 11B, 11S, 11F 9mm plunger 32 degrees

Early HD 11G 10mm, 28 degrees

Late HD 11 G 9mm, 32 degrees

And AC 45 with ADS 516 10mm, 28 degrees

Not sure if this will help with a 344 though

Posted By: Dozer
Date Posted: 06 Jun 2013 at 9:13am

My 1967 printing of the Fiat-Allis 6000 & 7000 motor service manual says the same. 28 BTDC for track type tractors and motor graders and
32 BTDC for tractor loaders. It did not call for different timing on the 6000 and 7000 motors

It is raining here so I'm not under my HD6G checking the bearings.

Posted By: Dozer
Date Posted: 06 Jun 2013 at 9:34am

Are you trying to find TDC to set the adjustable pointer on the flywheel? The crankshaft dampener should have two marks TDC 1 and FP1 Did you have to change the crankshaft dampener for your installation? I would like to se pictures of your project.