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Description
MerCruiser OMC GM 2.5L 120hp 4cyl Engine Main Bearing Caps 2pc Rear Seal 1973-86Part Number(s) Included Not necessarily a part number for these beyond the GM part number but basically these are the Main Bearing Caps for the crankshaft on the 1973 1986 (maybe some earlier years as well) GM 2. 5L 4cyl 120hp 2 piece rear main seal engines. Crankshaft Caps (x4) GM 3970194 MerCruiser 35310 Crankshaft End Cap (x1) GM 3928975 MerCruiser 49954 Bolts (x10) GM 3872781 MerCruiser 10 46717 (2 31 32") General Application Compatibility GM 2.
Part Number(s) Included
- Not necessarily a part number for these beyond the GM part number but basically these are the Main Bearing Caps for the crankshaft on the 1973-1986 (maybe some earlier years as well) GM 2.5L 4cyl 120hp 2-piece rear main seal engines.
- Crankshaft Caps (x4) GM 3970194 / MerCruiser 35310
- Crankshaft End Cap (x1) GM 3928975 / MerCruiser 49954
- Bolts (x10) GM 3872781 / MerCruiser 10-46717 (2-31/32")
General Application / Compatibility
- GM 2.5L I/L4 applications 1973-1986 with a one-piece rear main seal.
- MerCruiser
- OMC Cobra / Stringer
Other Details
- Freshwater Used Parts
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4.6 ★★★★★
Based on 1625 reviews
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Product Reviews
★★★★★ 5
Better Design - Better Materials - No Sticking
Style: 2.5" Ball
Been using Chuck-It launchers and plastic balls for a very long time and they were always a little sticky on giving up the ball. This makes it tricky to throw grounders with precision and can overshoot the fence in the backyard. A couple of years ago, Chuck-It changed the material to a stiffer plastic that made this problem more pronounced. I even tried custom sanding the cup to get just the right grip.
The Fetch-It launcher (using the Chuck-It plastic balls) uses a three-pronged claw with soft rubbery ends that releases perfect every time. The material costs on this new one are noticeably higher while maintaining a somewhat lower price than the brand name original.
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Reviewed in the United States on January 9, 2026
★★★★★ 3
Meh
Style: 2.5" Ball
It "works" but it isn't very good. The grip is so loose on the ball, it lets go early and doesn't thrown very far. A Chuckit is so much better, I can get 3x the distance with a 25" Chuckit. This thing is kind of a waste.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Good size, Durable, Easy to use
My dog doesn't really play with balls that much. But she does love a laser which I was hoping the light in this ball might mimic for her. And it does. She loves this ball. And the winter months when the days are short finding games we can play at the park is critical for her well-being.
The ball came in an attractive packaging with a charger and charged quickly. It's a simple push of the button on the light to activate it. It will turn off on its own but light back up when it's moved, which is handy.
The light has a soft glow to it which is pleasant to be around. The ball is easy to see at night and has a good bounce to it as well. My dog chewed on it for quite a bit and it's held up really well, so I will say it's pretty durable and chewable.
The weight in the ball is nice and it's an easy throw. My only suggestion is to make sure that you have the light piece locked in place first. I have thrown it where the ball and the light went in two different directions. And that was my fault. Lol
We have had some great fun with this ball at the park. For the short winter days it's a perfect addition to your pet's play routine. We love it.
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Reviewed in the United States on December 28, 2025
★★★★★ 1
Defective on arrival
Second ball defective.
First ball received would not light.
Second ball battery charged and locked. When unlocked to switch on light, the cylinder stuck in the ball and will not come out.
I'm very disappointed. I've sent back and hope the third functions properly.
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Reviewed in the United States on December 30, 2025
★★★★★ 5
Our Dog Is OBSESSED – Night Play Game Changer!
This light-up dog ball is a total hit in our house. As you can see from the photos, the glow is bright and easy to spot even in complete darkness, which makes nighttime play so much safer and more fun. The motion-activated light turns on instantly when my dog nudges or bites it, and the 90-second auto glow is perfect.
The silicone material feels soft but durable, gentle on teeth, and my dog loves carrying it around. USB-C charging is super convenient, and one charge easily lasts multiple evening play sessions. It’s also water-resistant, so no worries about grass or dew.
Perfect size for small to medium dogs, and it keeps my pup engaged and active after sunset. Highly recommend for anyone who wants fun, visible, and stress-free night play with their dog!
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Reviewed in the United States on January 8, 2026