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Parts for MerCruiser Race Engine and Drive 525 EFI Engine Components (Cylinder Block & Camshaft)

Engine Diagram

Ref. No. Part No. Description Manufacturer List Price Your Price Order
#1 841178A 1 PARTIAL ENGINE ASSEMBLY (1 required per assembly) - NOTE: Bravo Models With Driveline Also Require Pilot Bushing Part Number 23-823108
PARTIAL ENGINE AS 841178A 1  
841178A 1OEM Part 841178A 1 - Partial - 525 Efi (more info) About Mercury Marine $16,767.20 $16,767.20 Add to shopping cart
Available to order:
Usually ships
within 8 days
#2 22-32561 PLUG, Pipe - Allen Head (.250-18), Oil Gallery Rear Cam Plugs (3 required per assembly)
PLUG Pipe - Allen 22-32561 22-32561
22-32561OEM Part 22-32561 - Plug - Priced Individually (more info) About Mercury Marine $4.60 $4.60 Add to shopping cart
10+ in stock. Explain stock levels
#3 17-843379 PIN, Dowel (.6206/.6211 x 1.20), Flywheel Housing (2 required per assembly)
ORD 8M0092110     O NLA  
17-843379 ORD 8M0092110 O NLA
(more info)
    UnavailableUnavailable Parts
#4 805218T SENSOR, Coolant (1 required per assembly)
SENSOR ASSY-TEMP 805218T 805218T
805218TOEM Part 805218T - Temperature Sensor Assembly (more info) About Mercury Marine $32.83 $32.83 Add to shopping cart
Available to order:
Usually ships
within 8 days
Coolant Temp Sensor 18-7600
18-7600OEM Match 18-7600 - Sensor 805218T (more info) About Sierra Marine $29.99 $24.52 Add to shopping cart
5 in stock. Explain stock levels
#5 17-35312 PIN, Dowel (.250) Bottom Of Block (2 required per assembly)
PIN-DOWEL         O - Replaced by 17-843378  
17-35312This part has been superseded. PIN-DOWEL O - Replaced by 17-843378
(more info)
    UnavailableUnavailable Parts
PIN Dowel 17-843378  
17-843378OEM Part 17-843378 - Pin -Dowel (more info) About Mercury Marine $10.60 $10.60 Add to shopping cart
1 in stock. Explain stock levels
#6 22-36373 PLUG, (.375-18) Hex - Steel, Bottom Of Block Oil Plug (1 required per assembly)
PLUG (.375-18) He 22-36373  
22-36373OEM Part 22-36373 - Plug (more info) About Mercury Marine $4.10 $4.10 Add to shopping cart
4 in stock. Explain stock levels
#7 22-64013 FITTING, (.375 Male To .125 Female) (1 required per assembly)
FITTING (.375 Mal 22-64013  
22-64013OEM Part 22-64013 - Reducer (more info) About Mercury Marine $7.90 $7.90 Add to shopping cart
6 in stock. Explain stock levels
#8 881879011 SENSOR, Pressure (0 - 100 PSI), Oil Pressure (1 required per assembly)
SENSOR-PRESSURE   O - Replaced by -881879T11 881879011
881879011This part has been superseded. SENSOR-PRESSURE O - Replaced by -881879T11
(more info)
    UnavailableUnavailable Parts
SENSOR Pressure ( 881879T11 881879T11
881879T11OEM Part 881879T11 - Pressure Sensor (more info) About Mercury Marine $136.58 $136.58 Add to shopping cart
Available to order:
Usually ships
within 8 days
#9 16-862915 STUD, (.250-18/M10 Special), Knock Sensor Assembly Mount (2 required per assembly)
STUD (.250-18/M10 16-862915  
16-862915OEM Part 16-862915 - Stud (more info) About Mercury Marine $19.58 $19.58 Add to shopping cart
Available to order:
Usually ships
within 8 days
#10 11-826292 NUT, (M10) Brass/Nickel Plated (2 required per assembly)
NUT (M10) Brass/N 11-826292  
11-826292OEM Part 11-826292 - Nut (more info) About Mercury Marine $2.90 $2.90 Add to shopping cart
Available to order:
Usually ships
within 8 days
#11 878187 SENSOR ASSEMBLY, Knock (2 required per assembly)
SENSOR-KNOCK      O - Replaced by -8M6003194 878187
878187This part has been superseded. SENSOR-KNOCK O - Replaced by -8M6003194
(more info)
    UnavailableUnavailable Parts
SENSOR-KNOCK      O  
8M6003194 SENSOR-KNOCK O
(more info)
    UnavailableUnavailable Parts
KNOCK SENSOR 18-7554
18-7554OEM Match 18-7554 - Knock Sensor 878187 (more info) About Sierra Marine $88.16 $73.61 Add to shopping cart
3 in stock. Explain stock levels
#12 22-36382 FITTING, (.250-18 x .62) Brass, Lower Side Of Block (2 required per assembly)
FITTING (.250-18 22-36382 22-36382
22-36382OEM Part 22-36382 - Plug (more info) About Mercury Marine $3.90 $3.90 Add to shopping cart
2 in stock. Explain stock levels
Pipe Plug 18-8111-9
18-8111-9OEM Match 18-8111-9 - Pipe Plug (PK3) (more info) About Sierra Marine $10.77 $7.50 Add to shopping cart
10+ in stock. Explain stock levels
#13 19-34270 EXPANSION PLUG, (1.625) (6 required per assembly)
EXPANSION PLUG (1 19-34270 19-34270
19-34270OEM Part 19-34270 - Freeze Plug, 1-5/8 Inch (more info) About Mercury Marine $6.80 $6.80 Add to shopping cart
Available to order:
Usually ships
within 8 days
#14 17-845758 PIN, Dowel, .660 Relaxed Outside Diameter x .500 (4 required per assembly)
1752190 17-845758  
17-845758OEM Part 17-845758 - Pin -Dowel (more info) About Mercury Marine $2.30 $2.30 Add to shopping cart
10+ in stock. Explain stock levels
PIN 17-52190  
17-52190OEM Part 17-52190 - Pin -Dowel (more info) About Mercury Marine $7.50 $7.50 Add to shopping cart
Available to order:
Usually ships
within 8 days
#15 17-843143 PIN, Spring, Port Side - Timing Cover (1 required per assembly)
PIN Spring 17-843143  
17-843143OEM Part 17-843143 - Spring Pin (more info) About Mercury Marine $1.55 $1.55 Add to shopping cart
Available to order:
Usually ships
within 8 days
#17 845606 PLUG, (.250-18 x .410) Allen Head With Hole, Oil Gallery (2 required per assembly)
PLUG (.250-18 x . 845606 845606
845606OEM Part 845606 - Plug (more info) About Mercury Marine $3.23 $3.23 Add to shopping cart
Available to order:
Usually ships
within 8 days
#18 22-32802 2 PLUG, Pipe (.125-27) Brass, Oil Gallery (3 required per assembly)
PLUG Pipe (.125-2 22-32802  2 22-32802 2
22-32802 2OEM Part 22-32802 2 - Plug - (brass) - Priced Individually (more info) About Mercury Marine $5.50 $5.50 Add to shopping cart
6 in stock. Explain stock levels
Pipe Plug, 1/8-27 Npt Pipe 18-4263
18-4263OEM Match 18-4263 - Pipe Plug, 1/8-27 NPT Pi (more info) About Sierra Marine $4.49 $3.24 Add to shopping cart
Available to order:
Usually ships
within 8 days
#19 10-841389 SCREW, (.312-18 x .620) (4 required per assembly)
SCREW (.312-18 x 10-841389 10-841389
10-841389OEM Part 10-841389 - Screw (more info) About Mercury Marine $1.20 $1.20 Add to shopping cart
Available to order:
Usually ships
within 8 days
#20 845755 RETAINER, Lifter Guide (1 required per assembly)
RETAINER-LIFTER   O - Replaced by -8M0050807 845755
845755This part has been superseded. RETAINER-LIFTER O - Replaced by -8M0050807
(more info)
    UnavailableUnavailable Parts
RETAINER 8M0050807  
8M0050807OEM Part 8M0050807 - Lifter Retainer (more info) About Mercury Marine $39.92 $39.92 Add to shopping cart
Available to order:
Usually ships
within 8 days
#21 19-94140 EXPANSION PLUG (1 required per assembly)
EXPANSION PLUG 19-94140  
19-94140OEM Part 19-94140 - Plug (more info) About Mercury Marine $3.60 $2.02 Add to shopping cart
7 in stock. Explain stock levels
#22 849947T LIFTER (16 required per assembly)
LIFTER            O - Replaced by -849947T01 849947T
849947TThis part has been superseded. LIFTER O - Replaced by -849947T01
(more info)
    UnavailableUnavailable Parts
LIFTER 849947T01 849947T01
849947T01OEM Part 849947T01 - Lifter (more info) About Mercury Marine $121.58 $121.58 Add to shopping cart
Available to order:
Usually ships
within 8 days
#23 845754 GUIDE, Lifter (8 required per assembly)
GUIDE 845754 845754
845754OEM Part 845754 - Guide - Lifter (more info) About Mercury Marine $5.70 $5.70 Add to shopping cart
Available to order:
Usually ships
within 8 days
#24 2409-840919T CAMSHAFT (1 required per assembly)
CAMSHAFT          O - Replaced by 400-8M0043065 2409-840919T
2409-840919TThis part has been superseded. CAMSHAFT O - Replaced by 400-8M0043065
(more info)
    UnavailableUnavailable Parts
CAMSHAFT 400-8M0043065 4008M0043065
4008M0043065OEM Part 4008M0043065 - Camshaft (more info) About Mercury Marine $998.22 $998.22 Add to shopping cart
Available to order:
Usually ships
within 8 days
#25 92-15875 LUBE, Camshaft (8 Ounces) (AR required per assembly)
LUBE-CAMSHAFT     O NLA  
92-15875 LUBE-CAMSHAFT O NLA
(more info)
    UnavailableUnavailable Parts
#26 23-85684 BEARING SET (1 required per assembly)
BEARING SET 23-85684 23-85684
23-85684OEM Part 23-85684 - Bearing Set (more info) About Mercury Marine $88.00 $88.00 Add to shopping cart
Available to order:
Usually ships
within 8 days
#28 845941 RETAINER, Gear Thrust (1 required per assembly)
RETAINER 845941 845941
845941OEM Part 845941 - Retainer (more info) About Mercury Marine $18.75 $18.75 Add to shopping cart
Available to order:
Usually ships
within 8 days
#29 10-845943 SCREW, (.250-20 x .500) (2 required per assembly)
SCREW (.250-20 x 10-845943 10-845943
10-845943OEM Part 10-845943 - Screw (more info) About Mercury Marine $3.60 $3.60 Add to shopping cart
Available to order:
Usually ships
within 8 days
#30 8M8023355 TIMING SET KIT (1 required per assembly)
TIMING SET KIT 8M8023355  
8M8023355OEM Part 8M8023355 - Timing Set Kit (more info) About Mercury Marine $197.42 $197.42 Add to shopping cart
Available to order:
Usually ships
within 8 days
#31 NSS NOT SOLD SEPARATE, Crankshaft Sprocket (1 required per assembly)
#33 10-845942 SCREW, (.312-18 x .750) (3 required per assembly)
SCREW (.312-18 x 10-845942 10-845942
10-845942OEM Part 10-845942 - Screw (more info) About Mercury Marine $4.20 $4.20 Add to shopping cart
Available to order:
Usually ships
within 8 days
#34 27-843073A03 GASKET/SEAL SET, Engine Overhaul (1 required per assembly) - NOTE: See Gasket/Seal Set - Engine Overhaul Section For Complete Parts Listing
GASKET/SEAL SET   O - Replaced by 27-843073A06  
27-843073A03This part has been superseded. GASKET/SEAL SET O - Replaced by 27-843073A06
(more info)
    UnavailableUnavailable Parts
GASKET/SEAL SET E 27-843073A06 27-843073A06
27-843073A06OEM Part 27-843073A06 - Gasket/Seal Set (more info) About Mercury Marine $928.01 $928.01 Add to shopping cart
Available to order:
Usually ships
within 8 days