Piston U-Seal (UP) 6.000" x 5.250" x 0.625" - Polyurethane

Marsoni

M251S

$153.16

Get it in 3 business days with 1 day shipping. Friday, May 29

Piston U-Seal (UP) 6.000" x 5.250" x 0.625" - PolyurethaneProduct Details : Piston U Seal (UP) 6. 000" x 5. 250" x 0. 625" Polyurethane Part No: UP37505250 625 9250 Product Category: Piston Seals Product Type: Piston U Seal Profile: UP Material(s): Polyurethane Material Code: AU Durometer: 92A Temperature Range: 40F to +230F ( 40C to +110C) Pressure Range: 6000 PSI ( 414 Bar) Surface Speed: < 1. 6 ft s (0. 5 m s) System Of Measurement: Inch Bore Diameter: 6. 000" Dimensions: 6. 000" x 5. 250" x 0. 625"

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This starter did work but it was not a direct replacement for the starter in my 1986 Malibu skier with 5.7 mercruiser direct drive. This starter is a mini-starter, which is great in that it’s smaller and lighter but it meant that my starter bolts were too long and I had to add 3/8” stack of washers under the bolt heads. The bracket that supports the front of the starter to the engine block was also not able to be used because the new starter is shorter, although with the lighter starter, that bracket is probably no longer necessary. First few starts have been fine.

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Reviewed in the United States on July 10, 2025

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Jerry Sonnier

Boise, US

★★★★★ 5

Fit Great. Works great.

Fit perfectly Mercruiser 4.3

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Reviewed in the United States on March 22, 2026

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Amazon Customer

Port Orchard, US

★★★★★ 5

Boat once again starts

Easy install once I figured out how to reach the starter. Worked first try and my boat is starting again. I think being a contortionist would help with the install since it is under the engine and boats typically only have access from the top. It probably took me an hour to get the old one off and about 30 min to install the new. The symptom of the broken one was a click sound when trying to start the motor, but nothing turning over. Same sound with new. Battery or a jumper.

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Reviewed in the United States on October 10, 2025

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Todd McCarty

Chelsea, US

★★★★★ 5

Exactly what I needed

I didn't know my current starter was getting that bad over the years. But this is perfect, shipped on time, matched perfectly, boat started like it's never ran prior. I have owned this boat for 13 years. Very pleased

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Reviewed in the United States on May 26, 2026

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Milissa

Los Angeles, US

★★★★★ 5

Great starter for the best price

Great price and same exact part as the ones twice the price.

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Reviewed in the United States on September 30, 2025