OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives
Mercruiser exhaust manifold V6 conversion kit 4.3 liter
Alpha One 4.3 liter V6 262 manifold 1 piece to
2 piece conversion set
Last updated on 11/8/2023
- Complete conversion kit for 1 piece to 2 piece center rise manifold assembly
- For 6 cylinder 4.3 liter 262 CID models
- Includes port and starboard assemblies, risers / elbows, bellows and clamps
- Manufactured by GLM Marine with a 3 year warranty
- New design has more water circulation area for increased cooling
58992 Mercruiser conversion kit exhaust manifold V6
P/N 58992 4.3L V6 complete conversion kit
$999.95 US
$ 1,842.89 CDN
Included
P/N 51220 Exhaust manifold assembly / 99746A17 x 2
P/N 51110 / 98504A3 or 51140 / 807988A2 Elbow (3 inch or 4 inch) x 2
P/N 32170 Gasket / 27-99757 x 2 P/N 30240 Gasket / 27-863724 x 2
P/N 13991 90 degree hose fitting / 22-806926 x 2
P/N 13992 Drain plug / 22-806608A02 x 2
P/N 80140 O-ring for plug / 25-45253 x 2
P/N 22391 Stud / 16-49545 x 8
P/N 21248 Flange nut / 11-46335 x 8
P/N 89120 Upper bellow / 32-44348T x 2
P/N 89130 Lower bellow / 32-14358001 x 2
P/N 01100 Hose clamp / 54-815504372 x 12
P/N 50750 Exhaust tube / 14478T01 x 2
Removing the Single Piece Manifold
Before removing the assembly, make sure to disconnect the battery from the terminals. It is important to note that after installing the two piece assembly, the height of the elbow will be lower by up to a half inch. Refer to your Mercruiser repair manual to determine the ‘minimum’ riser height. If, it is not at or above the minimum height, a GLM spacer can be installed to raise it up to meet OEM spec.
1. Start by removing all the parts and mounting hardware (keep these).
2. Disconnect the water hose which is connected underneath, and remove whole assembly.
Installing the 2 Piece Assembly
Before beginning, wipe down all mounting and connecting surfaces of all pieces to ensure they are clean and free of oil or grease.
1. Start by installing the new water hose fittings into the new assembly, with the openings facing towards the front of the boat, pointed slightly outwards by a few degrees. Install the gasket, and torque the mounting screws to 33 ft.lbs or 45 Nm.
2. Next, install the starboard (right side) water hose with the clamp firmly tightened. You’ll need to route the port (left side) water hose underneath the power steering pump onto the fitting for the hose, and secure the clamp tightly.
3. Check the condition of the water shutters (flaps) – if they are damaged and do not function properly, replace these with GLM P/N 89175. If they are fine, install the plugs into the new elbows.
4. Make sure to apply a sealant or thread locker onto the main bolts connecting the manifold to riser, and torque these to 33 ft.lbs or 45 Nm. (note, these torque specs are different than the aluminum assemblies)
5. Connect the upper bellow, followed by the curved elbow tube and then the lower bellow using the included clamps.
Photo
Description / OEM #
Price (USD)
Price (Canadian)
51220 GLM
P/N 51220 Exhaust manifold assembly (1983 – up), serial numbers 6330183 – up.
99746A17
$218.95
$ 375.89
51140 elbow
P/N 51140 4 inch with 7 degree elbow / riser. Height of 6.75 inches.
807988A2
$143.95
$ 268.89
51100 Riser V6 262
P/N 51110 3 inch 15 degree elbow / riser
98504A3
$147.95
$ 314.89
32170 gasket
P/N 32170 Mounting gasket
27-99757
$6.95
$ 11.89
30240
P/N 30240 Riser gasket
(for raw water)
27-863724
$4.95
$ 7.89
21892 plug
P/N 21892 Plug (steel)
22-41622
$4.95
$6.89
89120
807988A2
$34.95
$ 48.89
89130 Mercruiser exhaust bellow
P/N 89130 Lower 4″ bellow
32-14358001
$32.95
$ 45.89
50750 Elbow tube
P/N 50750 Elbow tube
14478T01
$91.95
$ 193.89
01100 Hose clamp
P/N 01100 Hose clamp
54-815504372
13990 drain plug
P/N 13990 Hose fitting with drain plug kit. Includes 90 degree hose fitting, drain plug and o-ring.
22-806926A1
$6.95
$ 11.89
22381 Mounting screw
P/N 22381 Screw – steel, zinc plated. 8 units included in P/N 58222.
10-43749
$4.95
$6.89
22391 Threaded stud
P/N 22391 Steel stud, threaded on both ends (used for P/N 51110)
16-49645