Relief Valve System for Mercury / Mariner (175 HP V-6 (1976-1988 Combined Books)) Engine

Start Over Different Model > Different Engine Section > Relief Valve System

Reference numbers in this diagram can be found in a light blue row below — scroll down to order.
Each product listed is an OEM or aftermarket equivalent part. [ Example ]

Engine Diagram

Reference numbers in this diagram can be found in a light blue row below — scroll down to order.
Each product listed is an OEM or aftermarket equivalent part. [ Example ]

# — NLA — No Longer Available, Gasket Set (1 required per assembly) — (Service Bulletin 81-8) SN# USA-5875203/AUS-8072022 & Below
		NLA - No Longer Availab [ More info ] Unavailable
# — 11338A88 — GASKET SET, Engine Overhaul (1 required per assembly) — SN# 6618751 & Up
		27-11338A88 - Engine Overhaul Gasket Set [ More info ] Unavailable
		18-4319 - Gasket, 27-11338A88 [ More info ] $225.16 $202.22 In Stock
# — 79583A81 — GASKET SET (1 required per assembly) — SN# 5875204 THRU 6618750
		27-79583A81 - Engine Gasket Set [ More info ] Unavailable
#3 — 68729 — COVER (1 required per assembly) — (DESIGN I)
		68729 - Cover [ More info ] Unavailable
		68729 1 - Cover [ More info ] Unavailable
		8M0039767 - Cover [ More info ] Unavailable
#4 — 78690 — GASKET (2 required per assembly) — (DESIGN I)
		27-78690 - Cover To Block Gasket [ More info ] $3.42 1 In Stock.
		27-78690002 - Relief Valve Cover Gasket [ More info ] $3.90 10+ In Stock.
		18-0936-9 - Gasket 27-78690 2-Pack [ More info ] $4.99 $4.62 1 In Stock.
#5 — 65664 — RELIEF VALVE PLATE (1 required per assembly) — (DESIGN I)
		65664 - Relief Valve Plate, NLA [ More info ] Unavailable
#6 — 65663A 1 — COVER (1 required per assembly) — (DESIGN II)
		65663A 1 - Cover [ More info ] Unavailable
		65663A 2 - Cover Assembly [ More info ] $59.67 Available to Order: Usually ships within 10 days.
#7 — 65664A 1 — PLATE ASSEMBLY (1 required per assembly) — (DESIGN II)
		65664A 1 - Plate Assembly [ More info ] $29.44 2 In Stock.
#8 — 88907 — GASKET, RELIEF VALVE PLATE (2 required per assembly) — (DESIGN II)
		27-88907 - Relief Valve Plate Gasket [ More info ] $1.93 8 In Stock.
		27-88907003 - Relief Valve Plate Gasket [ More info ] $3.70 10+ In Stock.
		18-0952-9 - Gasket 27-88907 2-Pack [ More info ] $8.19 $7.90 Available to Order: Usually ships within 10 days.
#9 — 38837 — SCREW, (.312-18 x 1.12), COVER (2 required per assembly) — (DESIGN I & II)
		10-38837 - Screw - Priced Individually [ More info ] $3.10 10 In Stock.
#10 — 64877 — DIAPHRAGM (1 required per assembly) — (DESIGN I & II)
		64877 - Diaphragm [ More info ] Unavailable
		64877 1 - Diaphragm [ More info ] $11.30 8 In Stock.
#11 — 76451 — WASHER (1 required per assembly) — (DESIGN I & II)
		12-76451 - Washer, Diaphragm [ More info ] $2.70 10+ In Stock.
#12 — 69570 — SCREW, (#10-16 x .750) (1 required per assembly) — (DESIGN I & II)
		10-69570 - Screw [ More info ] $1.70 10+ In Stock.
#13 — 64878 — SPRING (1 required per assembly) — (DESIGN I & II)
		24-64878 - Spring, Compresion Poppet Valve [ More info ] $6.50 10+ In Stock.
#14 — 86596 — POPPET VALVE (1 required per assembly) — (DESIGN I & II)
		86596 - Poppet Valve [ More info ] $10.90 10+ In Stock.
#15 — 65848 — CARRIER (1 required per assembly) — (DESIGN I & II)
		65848 - Carrier [ More info ] $3.50 2 In Stock.
#16 — 64872 — GROMMET (1 required per assembly) — (DESIGN I & II)
		25-64872 - Grommet, Poppet Relief Valve [ More info ] $3.50 10+ In Stock.
#17 — 14462A 1 — COVER (1 required per assembly) — (DESIGN III)
		14462A 1 - Cover Assembly, NLA [ More info ] Unavailable
#18 — 74824 — SCREW, (.312-18 x 1.250) (4 required per assembly) — (DESIGN III)
		10-74824 - Screw - Priced Individually [ More info ] $1.70 Available to Order: Usually ships within 10 days.
#20 — 16497A 1 — PLATE (1 required per assembly) — (DESIGN III)
		16497A 1 - Plate Kit [ More info ] $42.25 Available to Order: Usually ships within 10 days.
#21 — 14479 — DIAPHRAGM (1 required per assembly) — (DESIGN III)
		14479 - Diaphragm [ More info ] Unavailable
		14479 1 - Diaphragm [ More info ] $19.55 5 In Stock.
#22 — 16496 — WATER DEFLECTOR (1 required per assembly) — (DESIGN III)
		16496 - Water Deflector [ More info ] $3.90 Available to Order: Usually ships within 10 days.
#26 — 14480 — POPPET (1 required per assembly) — (DESIGN III)
		14480 - Valve Poppet [ More info ] $10.30 4 In Stock.
#29 — 85303 — WASHER (1 required per assembly) — (DESIGN III)
		12-85303 - Washer [ More info ] $2.60 Available to Order: Usually ships within 10 days.