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1G 1g oil case 2g gears?

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AlmightySo

Proven Member
263
12
May 1, 2014
New Castle, Delaware
I just opened up my oil pump to inspect for any signs of marks inbended. I then noticed it has the worm gears thats in the 7bolt case. I know this is a 1g oil case due to the bottom of it being completely flat.
Is this fine? It does have a few marks and i can feel em with my nail, i can upload pics if needed
 
The "worm" gears, or helical gears, were in all late-model 4G63-powered DSMs -- all 7-bolts for sure. Generally, the "straight-cut", or spur, gears are attributed to the 1990 models. Mitsubishi ASA shows them being used in some 1991 models as well but not in 1992 models.

Oil pump gear swaps
 
Thank you guys for the info, soon ill become a walking book
From my research helical gears have more of a thrust load and causes a quicker oil pump failure. Id like to post some pics of my case and see what you guys think, re-use it and buy straight cut gears, & drop em in or buy a whole new case. The stub shaft area has spots i feel with my nail.
My engine is currently at the machine shop, should be picking it up this week and ill know what year it is for sure.
 
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