Diaphragm 648771
- Guaranteed fitment for 286 different models
- This is an OEM part manufactured by Mercury Marine
- Flat rate shipping starting at $4.95
- 30 day return policy
Product Description
1 Product Questions
Joe Enos
Answer:
Yes, that would be the correct DIAPHRAGM for your application.
57 Product Reviews
Mercury 75
Johnson Ocean Pro 150
- Repair Difficulty
- Medium
- Repair Time
- 30 to 60 mins
Problem fixed: Leaking water at poppet valve housing
Fired engine up for first time of the season and had water coming out of the weep hole, glad I made the repair of the poppet valve as the thermostat was full of salt and debris, if you replace the poppet get all of the related parts (diaphragm, spring, gasket, etc....), also while you are at it replace the thermostat, ran close to 20 miles after the repair with no issues.
Mercury 225
- Repair Difficulty
- Easy
- Repair Time
- Less than 30 mins
Problem fixed: Routine maintenance
Replaced the poppet valve, oil filter, and the water temperature sensor.
Mariner 115
- Repair Difficulty
- Easy
- Repair Time
- Less than 30 mins
Problem fixed: Replaced poppet valve diaphragm
Water was leaking from t-stat housing weep hole. Ordered diaphragm and housing gasket. Several of the bolts were very difficult to remove as aluminum oxide had built up it the through-drilled bolt holes in the cover.
Mariner
Johnson 15 Mercery 125 Yamaha 200
- Repair Difficulty
- Easy
- Repair Time
- 30 to 60 mins
Problem fixed: serveral, mostly tune-ups
Maintenance on all 3 motors, 2 of which are older motors.
Mercury xr2
- Repair Difficulty
- Medium
- Repair Time
- 30 to 60 mins
Problem fixed: Over heating at upper RPM.
Replaced poppet valve assembly.
Mercury 150 hp
Mercury 115
Mariner 75Hp
Mercury 80
- Repair Difficulty
- Easy
- Repair Time
- Less than 30 mins
Problem fixed: The engin was running rough and water was leaking out of the pop value
After removing the plate we saw the diaphragm had been eaten by salt and the thermostat was blocked by salt as well. We cleaned it up installed new parts and put it back together. It all fit perfectly and is back on the water
Mariner 100hp
- Repair Difficulty
- Easy
- Repair Time
- 30 to 60 mins
Problem fixed: Engine over heating
Removed water outlet, disposed of old thermostat and gasket. Cleared water cavity of salt debris then installed new parts. Runs perfect!
1984 merc black max 150
- Repair Difficulty
- Easy
- Repair Time
- Less than 30 mins
Problem fixed: popoff valve leaking weephole
mercury makes two configurations of popoff valves for this motor it took longer to find the right part than it took to install it. Crowley has excellent parts blowups that show the parts and their relationship to the area of concern, replaced diaphragm and no more problem.
Replace Oil tank & sensor 40 HP Mercury
Mercury Blackmax 135
- Repair Difficulty
- Medium
- Repair Time
- Less than 30 mins
Problem fixed: Water Temp Overheating
Best to refer to parts diagram to replace parts. It was fairly easy to do but I have some aviation mechanic experience that others may not have
1979 mercury/40 hp
- Repair Difficulty
- Easy
- Repair Time
- 30 to 60 mins
Problem fixed: Carburetor gaskets/thermostat
Debris got into the carburetor and thermostat was stuck open. Cleaned carburetor and replaced gaskets. Replaced thermostat and poppet valve. Runs great now!!!
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Supersession Chain
| Name | SKU | Superceding SKU |
|---|---|---|
| Diaphragm VIEWING THIS PRODUCT | 648771 | CURRENT |
| Diaphragm | 64877 | 648771 |