Exhaust Manifold & Exhaust Plate for Mercury / Mariner (150 HP Xr-2 Marathon Magnum (V-6) (1978-1985 Combined Book)) Engine

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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 ]

# — 90484A88 — GASKET SET (1 required per assembly) — SN# ME-6042946/MA-6038681 & Up
		27-90484A88 - Gasket Set [ More info ] Unavailable
# — 79583A81 — GASKET SET (1 required per assembly) — SN# 5866777 THRU 6042945
		27-79583A81 - Engine Gasket Set [ More info ] Unavailable
# — NLA — No Longer Available, Gasket Set (1 required per assembly) — (Service Bulletin 81-8) SN# ME-5866776/MA-6038680 & Below
		NLA - No Longer Availab [ More info ] Unavailable
#1 — 8133A 3 — CYLINDER BLOCK (1 required per assembly) — SN# ME-6042945/MA-6038680 & Below
		858-8133A 3 - Cylinder Block,NLA [ More info ] Unavailable
#1 — 8711A19 — CYLINDER BLOCK (1 required per assembly) — SN# ME-6042946/MA-6038681 & Up
		858-8711A19 - Cylinder Block [ More info ] Unavailable
		858-8711T19 - Cylinder Block,NLA [ More info ] Unavailable
#2 — 90484 1 — GASKET (2 required per assembly) — SN# 5432022 & Up
		27-90484 1 - Gasket - Priced Individually [ More info ] $22.96 3 In Stock.
#2 — 76636 — GASKET (2 required per assembly) — SN# 5432021 & Below
		27-76636 - Divider Plate Gasket [ More info ] $18.99 Available to Order: Shipping delay up to 10 days.
#3 — 87321 — PLATE (1 required per assembly) — SN# 5432022 & Up
		87321 - Plate [ More info ] Unavailable
		87321T - Plate [ More info ] $289.70 1 In Stock.
#3 — 78305A 1 — DIVIDER PLATE (1 required per assembly) — SN# 5432021 & Below
		78305A 1 - Plate Assembly, NLA [ More info ] Unavailable
#4 — 95067 — COVER (1 required per assembly) — SN# 5432022 & Up
		95067 - Exhaust Manifold Cover [ More info ] $93.99 $79.60 10+ In Stock.
#4 — 67340T — COVER (1 required per assembly) — SN# 5432021 & Below
		67340T - Cover [ More info ] $41.40 2 In Stock.
		67340 - Cover, NLA [ More info ] Unavailable
#5 — 74824 — SCREW, (.312-18 x 1.250) (21 required per assembly) — SN# 5432022 & Up
		10-74824 - Screw - Priced Individually [ More info ] $1.80 3 In Stock.
#5 — 35386 — SCREW, (.312-18 x 1.00) (17 required per assembly) — SN# 5432021 & Below
		10-35386 - Screw - Priced Individually [ More info ] $1.10 6 In Stock.
#6 — 69668 — SEAL (1 required per assembly)
		69668 - Divider Plate Seal [ More info ] $3.40 1 In Stock.
		26-814754 - Seal [ More info ] $11.09 4 In Stock.
#7 — 68729 — COVER, RELIEF VALVE (1 required per assembly) — SN# ME-6042945/MA-6038680 & Below
		68729 - Cover [ More info ] Unavailable
		68729 1 - Cover [ More info ] Unavailable
		8M0039767 - Cover [ More info ] $54.99 Available to Order: Shipping delay up to 10 days.
#7 — 65663A 1 — COVER, RELIEF VALVE (1 required per assembly) — SN# ME-6042946/MA-6038681 & Up
		65663A 1 - Cover [ More info ] Unavailable
		65663A 2 - Cover Assembly [ More info ] Unavailable
#8 — 38837 — SCREW, (.312-18 x 1.12), COVER (AR required per assembly)
		10-38837 - Screw - Priced Individually [ More info ] $3.19 $1.79 10+ In Stock.
#9 — 78690 — GASKET, RELIEF VALVE PLATE (2 required per assembly) — SN# ME-6042945/MA-6038680 & Below
		27-78690 - Cover To Block Gasket [ More info ] Unavailable
		27-78690002 - Relief Valve Cover Gasket [ More info ] $4.09 10 In Stock.
#9 — 88907 — GASKET, RELIEF VALVE PLATE (2 required per assembly) — SN# ME-6042946/MA-6038681 & Up
		27-88907 - Relief Valve Plate Gasket [ More info ] Unavailable
		27-88907003 - Relief Valve Plate Gasket [ More info ] $3.79 2 In Stock.
#10 — 65664 — PLATE ASSEMBLY, Relief Valve (1 required per assembly) — SN# ME-6042945/MA-6038680 & Below
		65664 - Relief Valve Plate, NLA [ More info ] Unavailable
#10 — 65664A 1 — PLATE ASSEMBLY (1 required per assembly) — SN# ME-6042946/MA-6038681 & Up
		65664A 1 - Plate Assembly [ More info ] $30.64 2 In Stock.
#11 — 64877 — DIAPHRAGM (1 required per assembly)
		64877 - Diaphragm [ More info ] Unavailable
		64877 1 - Diaphragm [ More info ] $11.79 10+ In Stock.
#12 — 76451 — WASHER (1 required per assembly)
		12-76451 - Washer, Diaphragm [ More info ] $2.79 7 In Stock.
#13 — 69570 — SCREW, (#10-16 x .750) (1 required per assembly)
		10-69570 - Screw [ More info ] $1.80 7 In Stock.
#14 — 64878 — SPRING (1 required per assembly)
		24-64878 - Spring, Compresion Poppet Valve [ More info ] $6.79 7 In Stock.
#15 — 86596 — POPPET VALVE (1 required per assembly)
		86596 - Poppet Valve [ More info ] $11.29 8 In Stock.
#16 — 65848 — CARRIER (1 required per assembly)
		65848 - Carrier [ More info ] $3.59 8 In Stock.
#17 — 64872 — GROMMET (1 required per assembly)
		25-64872 - Grommet, Poppet Relief Valve [ More info ] $3.59 10 In Stock.
#18 — 78069 — GASKET, EXHAUST PLATE (1 required per assembly) — SN# ME-6042945/MA-6038680 & Below
		27-78069 - Exhaust Plate Gasket [ More info ] $22.21 10+ In Stock.
		27-823142 1 - Gasket [ More info ] Unavailable
		27-823142 2 - Gasket [ More info ] $42.69 Available to Order: Shipping delay up to 10 days.
#18 — 99776 1 — GASKET, EXHAUST PLATE (1 required per assembly) — SN# ME-6042946/MA-6038681 & Up
		27-99776 1 - Gasket [ More info ] $19.69 Available to Order: Shipping delay up to 10 days.
#19 — 41944A 5 — PLATE ASSEMBLY (1 required per assembly) — SN# ME-6042945/MA-6038680 & Below
		41944A 5 - Exhaust Extension Plate, NLA [ More info ] Unavailable
#19 — 43029A 5 — PLATE ASSEMBLY (1 required per assembly) — SN# ME-6042946/MA-6038681 & Up
		43029A 5 - EXHAUST EXT PLAT,NLA [ More info ] Unavailable
#20 — 99664 — ELBOW (1 required per assembly)
		22-99664 - Elbow [ More info ] $1.00 3 In Stock.
		22-99664 1 - Elbow [ More info ] Unavailable
		22-99664 2 - Elbow [ More info ] $2.69 7 In Stock.
#21 — 70748 2 — SEAL (1 required per assembly)
		70748 2 - Seal, NLA [ More info ] $10.76 10+ In Stock.
#22 — 68010 — BRACKET (1 required per assembly)
		68010 - Bracket [ More info ] Unavailable
		68010 1 - Bracket [ More info ] $11.19 Available to Order: Shipping delay up to 10 days.
#23 — 48408 — SCREW, (#10-16 x .500) (8 required per assembly)
		10-48408 - Screw - Priced Individually [ More info ] $2.29 Available to Order: Shipping delay up to 10 days.
#24 — 20033 — PIN, Dowel (2 required per assembly)
		17-20033 - Pin -Dowel - Priced Individually [ More info ] $1.27 1 In Stock.
		17-43044 - Pin -Dowel-solid [ More info ] $2.49 1 In Stock.
#25 — 25970 — WASHER (2 required per assembly)
		12-25970 - Washer - Priced Individually [ More info ] $0.40 10+ In Stock.
		12-20553 - Washer - Priced Individually [ More info ] $1.50 6 In Stock.
#26 — 34863 — NUT, (.375-24) (2 required per assembly)
		11-34863 - Nut (3/8-24) [ More info ] Unavailable
		11-826709113 - Nut, (.375-24) Stainless Steel [ More info ] Unavailable
		11-8M0042636 - Nut - Brass , Priced Individually [ More info ] Unavailable
		118M0204726 - NUT-BRASS Note: Priced Individually [ More info ] $1.80 10 In Stock.
#27 — 27132 — BUSHING (1 required per assembly)
		23-27132 - Bushing [ More info ] $4.85 3 In Stock.
#28 — 66727 — SCREW, (.312-18 x 1.250) (1 required per assembly)
		10-66727 - Screw - Priced Individually [ More info ] $2.99 2 In Stock.
#29 — 68783 — SCREW, (.312-18 x 2.50) (1 required per assembly)
		10-68783 - Screw - Priced Individually [ More info ] $6.69 Available to Order: Shipping delay up to 10 days.
#30 — 66725 — SCREW, (.375-16 x 3.50) (3 required per assembly)
		10-66725 - Screw [ More info ] Unavailable
		10-898833 - Screw [ More info ] Unavailable
#31 — 12602 — GROMMET (1 required per assembly)
		25-12602 - Grommet , 7/16 in ID - 7/8 in long [ More info ] Unavailable
		25-12602 1 - Grommet [ More info ] Unavailable
		25-12602002 - Grommet (.44 I.d.) [ More info ] $4.59 Available to Order: Shipping delay up to 10 days.
#32 — 90435 — MOUNT (3 required per assembly) — SN# ME-6042945/MA-6038680 & Up
		90435 - Rubber Mount [ More info ] $61.44 1 In Stock.
#33 — 21249 — WASHER (6 required per assembly) — SN# ME-6042945/MA-6038680 & Below
		12-21249 - Washer - Priced Individually [ More info ] $8.49 $1.70 10+ In Stock.
#34 — 20361 — NUT, (.250-28) (6 required per assembly) — SN# ME-6042945/MA-6038680 & Below
		118267089 [ More info ] Unavailable
		11-826708 9 - Nut - Priced Individually [ More info ] $1.50 10+ In Stock.
		18-3722-9 - Lock Nut, 121731, 11-35888, Pack of 5 [ More info ] $11.99 $8.16 Available to Order: Shipping delay up to 10 days.
#35 — 42657A 1 — CHECK VALVE (1 required per assembly) — SN# ME-6042946/MA-6038681 & Up
		21-42657A 1 - Check Valve Assembly [ More info ] $7.78 6 In Stock.
		21-42657A 3 - Check Valve Assembly [ More info ] $7.29 Available to Order: Shipping delay up to 10 days.