Farm Equipment - 190XT gas oil pump timing

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190XT gas oil pump timing

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=204739
Printed Date: 06 Jan 2025 at 2:12pm
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Topic: 190XT gas oil pump timing

Posted By: wmchrisn
Subject: 190XT gas oil pump timing
Date Posted: 28 Dec 2024 at 2:40pm

Can anyone tell me on a 190XT gas 301 how to time the oil pump to the camshaft so the distributor drive will be correct? I can not find mention of it in my engine manual.

Replies:

Posted By: DrAllis
Date Posted: 28 Dec 2024 at 3:36pm

Using the crankshaft pulley, rotate the engine to TDC on number 1 cylinder. Install the oil pump such that when things are correct, the rotor in the distributor is pointing directly at the number 1 spark plug wire lug inside the dist cap. Using a timing light set the timing at 25 degrees BTDC at full throttle.

Posted By: wmchrisn
Date Posted: 28 Dec 2024 at 11:14pm

I noticed in the manual it shows 26 degree BTDC for diesel. The the gas and lp just show 26 degree. Are they both the same and they neglected to show the BTCD on the gas and lp? 26/25 not questioning that.

Posted By: SteveM C/IL
Date Posted: 28 Dec 2024 at 11:31pm

correct...almost all things are timed BTDC....never heard of ATDC for ignition timing

Posted By: wmchrisn
Date Posted: 28 Dec 2024 at 11:42pm

Thanks. I just looked at crank pulley. Marks don’t go that high on after side.

Posted By: DrAllis
Date Posted: 29 Dec 2024 at 7:38am

Also use one heat range colder spark plugs like AC Delco R44XL or XLS. Those engines cannot be allowed to detonate one bit. The tops of the pistons break off leaving the skirt and pin going up/down inside the cylinder sleeve.

Posted By: wmchrisn
Date Posted: 29 Dec 2024 at 10:38am

Got it running. Haven’t set timing with light yet but will today. Only issue now is every time I move the throttle the governor starts surging until I grab the linkage to stop it. It doesn’t have a secondary spring that has been added to two of my others but never has had one. I’ll go through manual and look about linkage adjustment. Just not sure what I did that would have changed it.

Posted By: DrAllis
Date Posted: 29 Dec 2024 at 11:05am

Provided there is nothing catching/binding on the governor to carb linkage, lengthen the yoke on the link rod a couple of turns and see what that does. No surge spring needed on that engine.

Posted By: NEVER green
Date Posted: 29 Dec 2024 at 2:51pm

Running lean cause the surge??

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2-8050 1-7080 6080 D-19 modelE & A 7040 R50

Posted By: DrAllis
Date Posted: 29 Dec 2024 at 3:36pm

There is no adjustable main jet. It is fixed like a Holley carb on a car.

Posted By: wmchris
Date Posted: 30 Dec 2024 at 2:57pm

Deleted duplicate comment

Posted By: wmchris
Date Posted: 30 Dec 2024 at 3:05pm

Also appears I have 2 accounts going here. I’ll fix that after this thread is done.

Posted By: wmchrisn
Date Posted: 01 Jan 2025 at 11:14am

I’m totally confused now. When using timing light the timing mark lines up with the right side pointer to run decent. This is a combine engine and the combine front plate does have the pointer on the right. The tractor plate has it on left. I used the tractor crank pulley but left the combine cam in it, which is different than tractor cam, mostly just because I thought it would be better for wear with the rest of the engine even though it is a lower rated rpm. Is the cam making it time to the right side pointer. Crank pulley is keyed so it can’t be wrong. Timing marks on the gears were lined up. The only other possibility I can come up with is I did use a salvage yard crank pulley as I broke my original during removal. I think the salvage pulley was marked 180 or 185. They looked the same but I never checked the timing marks location to see if they were same.

Posted By: DrAllis
Date Posted: 01 Jan 2025 at 5:19pm

You've apparently got a diesel crank pulley. Just set the timing to 25 degrees BTDC (at FULL throttle) from the right side and forget about it.

Posted By: wmchris
Date Posted: 01 Jan 2025 at 7:06pm

That’s all I could really figure. Not enough experience around diesels to know they were different. Mystery solved. Thank you very much.
Any idea why the offense in camshafts. Part numbers showed combine 301-G2800 and 180-G2500. Rated at 2000rpm. Showed 190XT-G2800 and 190-G2500 using a different one rated at 2200rpm. As mentioned above I stuck with the combine cam as most likely it will only be used light duty from here on out and was advised I would probably not notice the difference.

Posted By: DrAllis
Date Posted: 01 Jan 2025 at 7:26pm

Pretty sure the "grind" profile of those camshafts are all the same Older camshafts had a press on drive gear. Later models had a long bolt retaining the drive gear. Hence, two different p/n's.