Mercruiser Outdrive Parts Drawings *How to Videos

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Mercruiser exhaust, shift cable and u joint bellows

Mercruiser bell housing bellows for exhaust, u-joint, shift cable and engine manifold
  • Compatible with 4 cylinder, 6 cylinder inline, V6 and V8 Mercruiser models
  • Hoses for the exhaust manifold and outdrive bell housing
  • Adhesives and tools required for installation
  • Installation instructions for some items shown below parts chart

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Outdrive and bell housing bellows

89100 Exhaust Bellows 18654A1
89100 Exhaust Bellows 18654A1

P/N 89100 Accordian style. Includes clamps and clip. Replaces OEM 18654A1 or Sierra 18-2750. $22.15

For installation help, see our step by step instructions at bottom of page.

89150 Hose 78458A1
89150 Hose 78458A1

P/N 89150 Tube style. Includes clamps and clip. This newer style releases some of the back pressure when idling. Easier installation. *Note - this may cause more noise than the accordian style. Replaces OEM 78458A1 or Sierra 18-2760. $35.15

21950 Mercruiser Kit Transom 30-803097T1
21950 Mercruiser Kit Transom 30-803097T1

P/N 21950 Transom service kit. Includes #89100, #89050, #89080, 2 water hoses, gimbal bearing and oil seal with mounting gasket and seals. Replaces OEM 30-803097T1 or Sierra 18-2601. Compatible with 1973 - 1990 models only. $119.15

P/N 21950-1972 Same as above, but contains parts for the 1967 - 1972 stern drive models. $119.15

60932A4
60932A4

P/N 89050 Installed around the u-joints. Compatible with 1973 - 1990 models only. Make sure to replace this part if your current piece has any signs of cracks or damage. Includes clamps and 2 clips #89440. Replaces OEM 60932A4 or Sierra 18-2751. $38.15

For detailed help (including photos) with installing this item, please click on the picture or the part number

89040 U-Joint 36223A2
89040 U-Joint 36223A2

P/N 89040 Sames as above, except this part does not have a ridge on the inside of the lip. Includes clamp and 2 clips #89440. Compatible with 1967 - 1972 models (s/n 2062141-3443920 or 888 model s/n 3106717-3472477). Replaces OEM 36223A2 or Sierra 18-2752. $40.15

89080 Shift Cable Cover 74639A2
89080 Shift Cable Cover 74639A2

P/N 89080 Shift cable. Replaces OEM 74639A2 or Sierra 18-2753. $10.15

01100 Clamp 54-815504372
01100 Clamp 54-815504372

P/N 01100 Hose clamp for part #89050 and #89040. Replaces OEM 54-815504372 or Sierra 18-7316. $6.15

01070 Mercury 54-815504348
01070 Mercury 54-815504348

P/N 01070 Hose clamp. 2 required for #89100, 1 required for #89150. Replaces OEM 54-815504348 or Sierra 18-7314. $9.15

89440 Grounding Clip 54-86049
89440 Grounding Clip 54-86049

P/N 89440 Grounding clip. These must be used on part #89050 and #89040 to prevent electrolysis of the hose clamps. Replaces OEM 54-86049. $2.15

Engine Manifold Exhaust Hoses

89120
89120

P/N 89120 Upper hose for riser. 4 inch center mounted riser to 4 inch V6 and V8. Replaces OEM 32-44348T or Sierra 18-2748. $24.15

89090
89090

P/N 89090 Lower hose for riser. 3 inch elbow to 3 inch y-pipe. Replaces OEM 32-90949T or Sierra 18-2761. $29.15

89130
89130

P/N 89130 Lower - 4 inch elbow to 4 inch y-pipe. Replaces OEM 32-14358T or Sierra 18-2746. $27.15

89060 Elbow Tube 53114A1
89060 Elbow Tube 53114A1

P/N 89060 4 and 6 cylinder inline motors. Replaces OEM 53114A1 or Sierra 18-2759. $39.15

89070
89070

P/N 89070 3 inch center mounted riser to 4 inch elbow. Replaces OEM 70981A3 or Sierra 18-2762. $31.15

Installation Tools

90360 Expander Tool 91-45497A1
90360 Expander Tool 91-45497A1

P/N 90360 Expander tool. Makes installation of #89100 easier. Replaces OEM 91-45497A1. $48.00

18-9031 Sierra Adhesive
18-9031 Sierra Adhesive

P/N 18-9031 Adhesive compound required for installing the stern drive rubber hoses. This product must be used during installation or the parts will come loose out of the bell housing. $19.15

90200 Socket 91-45497A1
90200 Socket 91-45497A1

P/N 90200 Hinge pin tool. Required to remove side hinge pins in housing. Replaces OEM 91-78310 or Sierra 18-9861. $17.15

508235 Gasket Compound
508235 Gasket Compound

P/N 508235 Gasket sealing compound. $19.15

How To Replace Exhaust and U-Joint Bellows in the Mercruiser Bell Housing

The original tube (#18654A1 or GLM #89100) is an accordion style rubber hose measuring approximately 5-1/2” in length when not expanded, and an approximate outer diameter of 2-7/8” and inner diameter of 2-12”. As this is made of rubber, over time the material may become brittle and could break due to natural wear and tear. When inspecting this piece, look for any cracks or damage and replace if necessary. You have the option of replacing this with the original style, or the newer open ended tube style. The newer style (#78458A1 or GLM #89150) is approximately 4-3/4” in length, and only uses one clamp for installation into the gimbal housing side. When the drive is lowered, the flanges will fit into the open ended side of the rubber tube. The main benefit of using the newer style is it will release some of the back pressure; however this is a trade off with increased exhaust noise. Most people tend to choose the original accordion style as a replacement.

There are 2 ways to perform this job - with or without removing the stern drive 

Method 1

To do this job without removing the drive – you can simply turn the drive slightly to the port side (left) followed by removal of the clamps on the bottom of the bell housing. *Please note, this will save time by not having to remove the stern drive, however, installing the exhaust hose to the transom side will be a challenge. Installing the newer style hose will make installation easier as you only need to install it into one side. Get a firm grip on the gimbal side of the part and begin to pull it out of the housing. Since the old piece was likely installed with an adhesive or glue, you’ll need to pull using force; you can even raise the stern drive to assist with the removal. Before installing the new part, clean the areas of the bell and gimbal housing where it will sit using a wire brush or course sandpaper, and clean thoroughly with a cleaning agent. This will ensure the adhesive material will properly seal between the housing flange and rubber piece. New replacement parts will come with new grounding clips and stainless steel hose clamps – make sure to use the new ones and avoid re-using the old ones as they may be corroded or damaged. Always make sure to use an adhesive / glue (Sierra #18-9031) when working with these rubber parts. (This can be purchased above, in the repair tool section. Begin by applying the glue to the inside of both ends of the tube (only one side for the newer style piece), and around the mounting flanges on both housings. Allow the glue to set for a few minutes, and proceed to place the hose clamp on the gimbal side of the hose and install – making sure to tighten the clamp. Next, place the clamp on the other side of the piece and pull open while stretching (using considerable force) onto the flange on the transom side. This will take a considerable amount of time; if you’re not able to get it on you will need to remove the stern drive to finish the installation. (See instructions below). Start engine and check for any leaks.

Method 2

To do this job with the out drive removed, it is recommended you use the expander tool (#91-45497A1 or GLM #90360. This can be purchased above in the tool section). You'll notice a hole on the side of the bell housing which allows you to access the screws on the hose clamps using a long screwdriver. This hole is on most models, except for the very old models. Remove both clamps, and begin to remove the rubber hose from both flanges by pulling / wiggling with force. The adhesive applied to the part being removed can make this difficult to get off, so be patient. Next, clean the mounting areas on the housing flanges; and install rubber the hose onto the gimbal housing flange (described in method 1 above). Apply glue on the inside of the other side of the hose along with the hose clamp. Next, using the expander tool, slide it through the housing into the exhaust hose and ‘expand’ it. While the tool spreads the rubber open, pull it gently onto the flange on the transom side. Tighten the clamp using the access hole on the side of the housing. Start the engine and look for any leaks.

Optional Installation

Since the above noted job can be very time consuming (3 - 6 hours), it is recommended to inspect your gimbal bearing while your're at it. To check the gimbal bearing, spin in in the housing by hand and take note of the feel and sound it makes. When properly functioning, it should be smooth with no sticking points. If you hear and feel a grinding, or it has some points where it sticks you'll need to replace it. You can purchase gimbal bearing P/N 21905 please look here. When installing the new bearing, make sure to align the outer tolerance right so the grease hole is visible - pointed up and aligned with the grease input in the housing. You may also need to align the coupler with the bearing by using the engine alignment tool P/N 90050 please look here.

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