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Parts for Mariner 25 HP (4-Stroke) Powerhead Gasket Set Components

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Ref. No. Part No. Description Manufacturer List Price Your Price Order
#- 27-830270A02 GASKET SET (1 required per assembly)
GASKET SET 27-830270A02 27-830270A02
27-830270A02OEM Part 27-830270A02 - Gasket Set (more info) About Mercury Marine $105.83 $105.83 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 25-33466 O-RING, Carb Isolator (2 required per assembly)
O-RING 25-33466 25-33466
25-33466OEM Part 25-33466 - O-Ring - Priced Individually (more info) About Mercury Marine $2.10 $2.10 Add to shopping cart
10+ in stock. Explain stock levels
O-Ring 18-7164-9
18-7164-9OEM Match 18-7164-9 - O-Ring (PK5) 25-33466 (more info)
Replaces OEM #0302537
About Sierra Marine $12.45 $7.41 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 878431 SEAL, Diffuser (1 required per assembly)
SEAL 878431 878431
878431OEM Part 878431 - Seal (more info) About Mercury Marine $3.60 $3.60 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 26-822647 SEAL, Valve Stem, Valve Stem (4 required per assembly)
SEAL Valve Stem 26-822647  
26-822647OEM Part 26-822647 - Seal (more info) About Mercury Marine $20.20 $17.30 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 27-825231 2 GASKET, Cylinder Block (1 required per assembly)
GASKET            O - Replaced by 27-8M0069692 27-825231  2
27-825231 2This part has been superseded. GASKET O - Replaced by 27-8M0069692
(more info)
    UnavailableUnavailable Parts
GASKET 27-8M0069692  
278M0069692OEM Part 278M0069692 - Gasket (more info) About Mercury Marine $28.58 $28.58 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 27-830298 GASKET, Exhaust Cover (1 required per assembly)
GASKET 27-830298 27-830298
27-830298OEM Part 27-830298 - Gasket (more info) About Mercury Marine $34.90 $29.88 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 27-824853 GASKET, Thermostat Cover (1 required per assembly)
GASKET 27-824853 27-824853
27-824853OEM Part 27-824853 - Gasket (more info) About Mercury Marine $8.30 $8.30 Add to shopping cart
Available to order:
Usually ships
within 8 days
Thermostat Gasket 18-0835
18-0835OEM Match 18-0835 - Thermostat Gasket Yamaha (more info) About Sierra Marine $3.99 $2.95 Add to shopping cart
1 in stock. Explain stock levels
#0 832734A 2 BREATHER COVER (1 required per assembly)
BREATHER COVER 832734A 2  
832734A 2OEM Part 832734A 2 - Breather Cover (more info) About Mercury Marine $11.50 $11.50 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 27-854780 1 GASKET, Breather Cover (1 required per assembly)
GASKET 27-854780  1  
27-854780 1OEM Part 27-854780 1 - Gasket (more info) About Mercury Marine $6.10 $6.10 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 25-854722 O-RING (98MM x 2MM) (1 required per assembly)
O-RING 25-854722  
25-854722OEM Part 25-854722 - O-Ring (more info) About Mercury Marine $1.90 $1.90 Add to shopping cart
1 in stock. Explain stock levels
#0 26-825048 SEAL, Oil, Cylinder Head (1 required per assembly)
SEAL Oil 26-825048  
26-825048OEM Part 26-825048 - Seal (more info) About Mercury Marine $19.25 $19.25 Add to shopping cart
10+ in stock. Explain stock levels
#0 25-833103 O-RING, Cylinder Head Cover (1 required per assembly)
O-RING 25-833103  
25-833103OEM Part 25-833103 - O-Ring (more info) About Mercury Marine $37.17 $37.17 Add to shopping cart
3 in stock. Explain stock levels
#0 27-830270 GASKET, Cylinder Head (1 required per assembly)
GASKET            O - Replaced by 27-8M0049885 27-830270
27-830270This part has been superseded. GASKET O - Replaced by 27-8M0049885
(more info)
    UnavailableUnavailable Parts
GASKET 27-8M0049885  
27-8M0049885OEM Part 27-8M0049885 - Gasket (more info) About Mercury Marine $49.58 $49.58 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 25-826152 O-RING, Oil Pump (1 required per assembly)
O-RING 25-826152  
25-826152OEM Part 25-826152 - O-Ring (more info) About Mercury Marine $2.60 $2.60 Add to shopping cart
1 in stock. Explain stock levels
#0 25-826154 O-RING, Oil Pump (1 required per assembly)
O-RING 25-826154  
25-826154OEM Part 25-826154 - O-Ring (more info) About Mercury Marine $1.60 $1.60 Add to shopping cart
1 in stock. Explain stock levels
#0 25-826153 O-RING, Oil Pump (1 required per assembly)
O-RING 25-826153  
25-826153OEM Part 25-826153 - O-Ring (more info) About Mercury Marine $6.70 $6.70 Add to shopping cart
1 in stock. Explain stock levels
#0 26-825027 SEAL, Crankshaft-Top (1 required per assembly)
SEAL              O - Replaced by 26-893949  
26-825027This part has been superseded. SEAL O - Replaced by 26-893949
(more info)
    UnavailableUnavailable Parts
SEAL Oil 26-893949  
26-893949OEM Part 26-893949 - Oil Seal (more info) About Mercury Marine $23.58 $23.58 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 26-832013 SEAL, Crankshaft-Bottom (1 required per assembly)
SEAL              O - Replaced by 26-893948  
26-832013This part has been superseded. SEAL O - Replaced by 26-893948
(more info)
    UnavailableUnavailable Parts
SEAL Oil 26-893948  
26-893948OEM Part 26-893948 - Oil Seal (more info) About Mercury Marine $9.00 $9.00 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 25-825492 O-RING, Fuel Pump (1 required per assembly) (Use where Applicable)
258M0052669 25-825492  
25-825492OEM Part 25-825492 - O-Ring (more info) About Mercury Marine $5.00 $5.00 Add to shopping cart
1 in stock. Explain stock levels
O-RING 25-8M0052669  
25-8M0052669OEM Part 25-8M0052669 - O-Ring (more info) About Mercury Marine $1.90 $1.90 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 25-90196 O-RING, (.921 x .139), Cylinder Head Cover Plug (1 required per assembly) (.921 ID X .139 Dia.)
O-RING (.921 x .1 25-90196  
25-90196OEM Part 25-90196 - O-Ring (more info) About Mercury Marine $3.30 $3.30 Add to shopping cart
Available to order:
Usually ships
within 8 days
#0 27-828816 GASKET, Driveshaft Housing Plug (1 required per assembly)
GASKET 27-828816 27-828816
27-828816OEM Part 27-828816 - Gasket (more info) About Mercury Marine $3.30 $3.30 Add to shopping cart
Available to order:
Usually ships
within 8 days