Boating Solutions Mercury Mariner Outboard Pistons and Rings Parts Guide

 

Mercury 2 Ring Inline Piston and Ring Application

H.P. Beginning Serial No. Ending Serial No. Std. Cyl. Dia. (Bore) Std. Piston .015 O.S. Piston .030 O.S. Piston Std. Rings .015 O.S. Rings .030 O.S. Rings Qty. Req'd
3.5 6202173 & UP 2.000 - - - 18-3900 - - 1
3.6 5404657 & UP 2.000 - - - 18-3900 - - 1
3.9 1655013 2498135 2.000 - - - 18-3900 - - 1
4 (1 cyl.) 2498136 A809600 2.000 - - - 18-3900 - - 1
4.5 4107220 & UP 2.000 - - - 18-3900 - - 1
7.5 2529895 & UP 2.000 - - - 18-3900 - - 2
9.8 1470349 & UP 2.000 - - - 18-3900 - - 2
20 1292910 5942040 2.562 - - - 18-3903 - - 2
25 1467499 1499331 2.562 - - - 18-3902 - - 2
35 6445653 & UP 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 2
40 (4 cyl.) 1280685 1496509 2.562 - - - 18-3903 - - 4
40 2045260 C159199 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 2
40 (4 cyl.) C159200 & UP 2.562 - - - 18-3903 - - 4
45 1476510 & UP 2.562 - - - 18-3903 - - 4
50 (4 cyl.) 1421113 6428680 2.562 - - - 18-3903 - - 4
50 6428681 & UP 2.875 18-4500 18-4515 18-4530 18-3918 18-3919 18-3920 3
60 1303411 1542744 2.562 - - - 18-3903 - - 6
60 6428681 & UP 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 3
65 3293154 4571651 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 3
70 1296411 1566239 2.875 - - - 18-3903 - - 6
70 4571652 6428680 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 3
75 6432901 A996141 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 4
80 2559001 3493912 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 4
80 4831999 6432900 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 4
85 Merc. 3493913 4831998 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 4
85 Mar. 4731898 4842728 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 4
90 4845301 A996141 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 6
95 1962187 2318585 2.875 - - - 18-3918 18-3919 18-3920 6
100 SS 2318586 2836018 2.875 - - - 18-3918 18-3919 18-3920 6
100 BP 2399698 2641854 2.875 - - - 18-3918 18-3919 18-3920 6
115 Merc. 2836019 5829643 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 6
115 Merc. 5829644 B209467 2.875 18-4500 18-4515 18-4530 18-3918 18-3919 18-3920 6
115 Mar. 5738891 5861526 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 6
115 Mar. 5861527 C10000 2.875 18-4500 18-4515 18-4530 18-3918 18-3919 18-3920 6
125 2314956 2839368 2.875 - - - 18-3918 18-3919 18-3920 6
125 BP 2641955 3253111 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 6
135 2839369 3293233 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 6
140 3293234 3502805 2.875 18-4505 18-4520 18-4535 18-3918 18-3919 18-3920 6
140 4865678 & UP 2.875 18-4500 18-4515 18-4535 18-3918 18-3919 18-3920 6
150 3502806 5327662 2.875 18-4500 18-4515 18-4530 18-3918 18-3919 18-3920 6

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Mercury 3 Ring Inline Piston and Ring Application

H.P. Beginning Serial No. Ending Serial No. Std. Cyl. Dia. (Bore) Std. Piston .015 O.S. Piston .030 O.S. Piston Std. Rings .015 O.S. Rings .030 O.S. Rings Qty. Req'd
3.5 6202173 & UP 2.000 - - - 18-3900 - - 1
3.6 5404657 & UP 2.000 - - - 18-3900 - - 1
3.9 1655013 2498135 2.000 - - - 18-3900 - - 1
4 (1 cyl.) 2498136 A809600 2.000 - - - 18-3900 - - 1
4.5 4107220 & UP 2.000 - - - 18-3900 - - 1
7.5 2529895 & UP 2.000 - - - 18-3900 - - 2
9.8 1470349 & UP 2.000 - - - 18-3900 - - 2
20 1292910 5942040 2.562 - - - 18-3903 - - 2
25 1467499 1499331 2.562 - - - 18-3903 - - 2
35 6445653 & UP 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 2
40 (4 cyl.) 1280685 1476509 2.562 - - - 18-3903 - - 4
40 2045260 C159199 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 2
40 (4 cyl.) C159200 & UP 2.562 - - - 18-3903 - - 4
45 1476510 & UP 2.562 - - - 18-3903 - - 4
50 (4 cyl.) 1421113 6428680 2.562 - - - 18-3903 - - 4
50 6428681 & UP 2.875 18-4154 18-4155 18-4156 18-3902 18-3916 18-3917 3
60 1303411 1542744 2.562 - - - 18-3903 - - 6
60 6428681 & UP 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 3
65 3293154 4571651 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 3
70 1296411 1566239 2.875 - - - 18-3903 - - 6
70 4571652 6428680 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 3
75 6432901 A996141 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 4
80 2559001 3493912 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 4
80 4831999 6432900 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 4
85 Merc. 3493913 4831998 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 4
85 Mar. 4731898 4842728 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 4
90 4845301 A996141 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 6
95 1962187 2318585 2.875 - - - 18-3902 18-3916 18-3917 6
100 SS 2318586 2836018 2.875 - - - 18-3902 18-3916 18-3917 6
100 BP 2399698 2641854 2.875 - - - 18-3902 18-3916 18-3917 6
115 Merc. 2836019 5829643 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 6
115 Merc. 5829644 B209467 2.875 18-4154 18-4155 18-4156 18-3902 18-3916 18-3917 6
115 Mar. 5738891 5861526 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 6
115 Mar. 5861527 & UP 2.875 18-4154 18-4155 18-4156 18-3902 18-3916 18-3917 6
125 2314956 2839368 2.875 - - - 18-3902 18-3916 18-3917 6
125 BP 2641955 3253111 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 6
135 2839369 3293233 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 6
140 3293234 3502805 2.875 18-4151 18-4152 18-4153 18-3902 18-3916 18-3917 6
140 4865678 & UP 2.875 18-4154 18-4155 18-4156 18-3902 18-3916 18-3917 6
150 3502806 5327662 2.875 18-4154 18-4155 18-4156 18-3902 18-3916 18-3917 6

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Mercury V-6 Piston and Ring Application

HP Beginning Serial No. Ending Serial No. Std. Bore Std. (Port) Std. (Stbd) .015" O.S. (Port) .015" O.S. (Stbd) .030" O.S. (Port) .030" O.S. (Stbd) Qty. Req'd Std. Rings .015" O.S. Ring .030" O.S. Rings Qty. Req'd
135 A904646 C239553 3.125 18-4510 18-4545 18-4525 18-4560 18-4540 18-4575 3 18-3921 18-3922 18-3923 6
135/150 (1) C239553 D082000 3.125 18-4510 18-4545 18-4525 18-4560 18-4540 18-4575 3 18-3921 18-3922 18-3923 6
135/150 (2) C239553 D082000 3.125 - - - - - - 3 18-3921 18-3922 18-3923 6
150 4868998 C239553 3.125 18-4510 18-4545 18-4525 18-4560 18-4540 18-4575 3 18-3921 18-3922 18-3923 6
175 43012535 6618750 3.125 18-4510 18-4545 18-4525 18-4560 18-4540 18-4575 3 18-3921 18-3922 18-3923 6
175 (3) 6618750 D082000 3.375 18-4600 18-4615 - - - - 3 18-3927 - - 6
200,200EFI,225 4839034 C291519 3.375 18-4600 18-4615 - - - - 3 18-3927 - - 6
220 B117316 UP 3.375 18-4600 18-4615 - - - - 3 18-3927 - - 6
XR4/MAG II B242885 UP 3.375 18-4550 18-4555 18-4570 18-4570 18-4580 18-4585 3 18-3924 18-3925 18-3926 6

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Mercury Piston Sleeves

Part No. I.D. O.D. Wall Length Description
18-4710 3.125 3.3125 0.09375 5.520 Straight sleeve with ports cut in.
18-4713 3.375 3.5625 0.09375 5.550 Straight sleeve with ports cut in and finger ports cut in.
H.P. Years CID Sleeve
135 1986-92 121.9 CID 18-4710
150 1979-92 121.9 CID 18-4710
150XR2 1985-88 121.9 CID 18-4710
150XR4 1989-91 142.2 CID 18-4713 Chrome Bore
175 1978-81 121.9 CID 18-4710
175 1985-91 142.2 CID 18-4713 Chrome Bore
200 1982-91 142.2 CID 18-4713 Chrome Bore

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Mariner Outboard Piston Kits & Rings

Japanese Models

Model Ser #Code Ser #

Standard

Piston

.25mm

Piston

.50mm

Piston

Standard

Rings

.25mm

Rings

.50mm

Rings

Qty.

Req�d
9.9 682 ALL 18-4135 18-4136 18-4137 18-3976 18-3977 18-3978 2
15C 684 ALL 18-4135 18-4136 18-4137 18-3976 18-3977 18-3978 2
20C,25A 6A9 ALL � � � 18-3985 18-3986 18-3987 2
25C 695 ALL � � � 18-3985 18-3986 18-3987 2
28 664 ALL � � � 18-3985 18-3986 18-3987 2
30A 689 ALL 18-4138 18-4139 18-4140 18-3954 18-3955 18-3956 2
48 670 S-02440 & Below / L33131 & Below � � � 18-3988 18-3989 18-3990 2
55 M, ML 663 ALL � � � 18-3988 18-3989 18-3990 2
48 670 S-02441 & Up / L-33132 & Up � � � 18-3991 18-3992 18-3993 2
W48 670 M 002731 & Up / ML 314101 & Up � � � 18-3991 18-3992 18-3993 2
60 675 E 00101-001170 / EL 30101-304180 � � � 18-3991 18-3992 18-3993 2
W48 670 M 002730 & Below / ML 314100 & Below � � � 18-3994 18-3995 18-3996 2
W48 670 M 007191 & UP / ML 334241 & UP � � � 18-3994 18-3995 18-3996 2
55 663 E 004041 & UP / EL 315379 & UP � � � 18-3994 18-3995 18-3996 2
W55 663 ML 578278  Up � � � 18-3994 18-3995 18-3996 2
60  2 CYL 675 E 001171  Up / EL 304181 & Up � � � 18-3994 18-3995 18-3996 2

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