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2G Oil pump failure.


Proven Member
Aug 29, 2019
Wheat Ridge, Colorado
What started with my timing belt starting to shred itself has turned into so much more. Something in my gut told me to pull the motor cause something was wrong, and I’m glad i did. Pulled the oil pump to find the drive gear was so scored it left material in the front case. The balance shaft delete was an old balance shaft cut off and welded, that had some wear marks, but nothing like the drive gear. The motor never lost oil pressure as far as my Glowshift oil pressure gauge has showed as well.

I dug more and started to check piston 1 and 4 bearings and this is what I found. Both sides of the rod bearings in both cylinders are pretty the same way. The pictures attached are from cylinder 1. I noticed the slightest bit of heat marks on the crank. The cylinder 1 rod cap was hard to get off compared to cylinder 4s.

Realistically, what are my options. Plastigauge, and send it with new bearings, or pull it completely apart and get everything cleaned and machined? It has an eagle crank, eagle rods, and JE pistons. Motor was bought second hand from Performance Partout but bearings weren’t like this before it was installed in my car. I’m about ready to just send the rotating assembly to the machine shop with the original block from the car to get put together. But I’m to broke for that at the moment.

I attached the pictures from the belt being shredded to how it sits now. None of this explains why my belt was being thrashed, but I’m glad I dug into the motor. Seems I caught things before it decided to window the block.

View attachment 626100
















Proven Member
Aug 29, 2019
Wheat Ridge, Colorado
Did some plastiguage measurements. Crank is almost out of spec on the rod bearings with 1mm over bearings. Pulled the crank out and took a look at the mains. Motor is being completely disassembled and being sent to machine shop.

The motor is a 2.3L build using a 100mm crank and JE stroker pistons P/N: JEP 270666. I found a 4g64 crank cleaned, polished, and checked with specs. Rods will be checked and aligned to the new crank. Block looks good and can hopefully be honed out and doesn’t need bored. In the off chance it needs bored out, should I find pistons that can fit the new bore, or use this spare virgin block to get bored to match the pistons.


Proven Member
Feb 9, 2019
Birmingham, Alabama
Might be a tensioner going bad. I bought a long block from the yard that had a snapped timing belt. It was because the bearing in the tensioner pulley locked up. The belt took a lot of damage before it snapped.

Also, oil makes the belt more prone to slipping and cracking, and even swelling if it's high mileage oil. I see some drippage on his timing components so I'm sure it's not helping.


DSM Wiseman
Jun 12, 2014
Japan / Mexico, Arizona
What do you think is shredding the timing belt?
I guess that's most likely caused by the oil pump drive gear shaft and the sprocket being not sitting straight due to internal damage. The timing belt was distorted/sliding toward outside at the oil pump sprocket and kept being stressed by oil pump sprocket rib.
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