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Overton's
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I'm Restoring A 1955 Merc MK55 Sandcast

1955 Mark 55 Sandcast Restoration

 

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Bill the Master Tech

 

If your Mfgr. says:

That motor's 7 years old.
Part is no longer available.
We lose $$ on service!
EPA made me do it!
Parts at central warehouse, you'll get them next month.
We don't make parts for those.
We only do warranty work.
Our techs only fix late models.
No clue what's wrong! So we'll work time & material.

Baloney!!

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NEW & REBUILT GEARCASES

Concerned about your gearcase or water pump? Try our gearcase tips page.

Need a COBRA drive mounting gasket kit (1986-1993)? It's HERE

warning symbolNOTE!! You MUST PROVIDE THE MODEL and YEAR when ordering. I cannot send you the correct parts otherwise!
Also, please be sure what you have: OMC Stern Drives (Stringer Models) are tilted by an external gear (mechanical tilt); OMC Cobra Models are hydraulically tilted and have the water pump in the upper gear housing; Cobra SX models are likewise tilted but are manufactured starting with the 1994 model year and have a belt-driven seawater pump on the motor. COBRA SX drives are NOT AVAILABLE from our rebuilder at this time.

Please take the time to enter the model and serial number of your motor!
It will be stored in the shopping cart and sent in with your order. Thanks!
Model & Year

First On line purchase?

NEW and Rebuilt units carry a 1 (one) year warranty. This is a supplier warranty. Most units have core value (included in price). Return shipping for cores is prepaid, if you have a repairable unit. MasterTech will remit the core credit after evaluation by the rebuilder.

Rebuilt and new gearcases are subject to availability.

AUGUST 2008:

PRICES HEREIN ARE NOT FIRM, SINCE THERE HAVE BEEN RECENT PRICE CHANGES; WE HAVE NOT HAD
TIME TO UPDATE THIS PAGE YET. PLEASE CALL FOR PRICING.

OMC STERN (STRINGER) DRIVE GEARCASES
400/800 SERIES UP TO 1985
NO CORE VALUE ON ANY STRINGER DRIVE COMPONENT
CYL
 DESCRIPTION CORE PRICE PURCHASE
4
 OMC Stern (Stringer) Drive
4-CYLINDER
Rebuilt Upper 1969-77
No Core
Required
$1,875
6
 OMC Stern (Stringer) Drive
6-CYLINDER
Rebuilt Upper 1969-77
No Core
Required
$1,875
8
 OMC Stern (Stringer) Drive
8-CYLINDER
Rebuilt Upper 1969-77
No Core
Required
$1,875
ALL
 OMC Stern (Stringer) Drive
4-6-8-CYLINDER
Rebuilt Lower 1969-77
No Core
Required
$1,605
CYL
 DESCRIPTION CORE PRICE PURCHASE
4
 OMC Stern (Stringer) Drive
120-140 HP 2.5 - 3.0L
Rebuilt Upper 1978-85
No Core
Required
$1,875
6
 OMC Stern (Stringer) Drive
170-185 HP 3.8L V6
Rebuilt Upper 1978-85
No Core
Required
$1,875
6
 OMC Stern (Stringer) Drive
170-185 HP 3.8L V6
New Upper 1978-85
No Core
Required
$2,116
8
 OMC Stern (Stringer) Drive
185-230 HP 5.0L V8
Rebuilt Upper 1978-85
No Core
Required
$1,875
8
 OMC Stern (Stringer) Drive
185-230 HP 5.0L V8
New Upper 1978-85
No Core
Required
$2,116
8
 OMC Stern (Stringer) Drive
185-230 HP 5.7L V8
Rebuilt Upper 1978-85
No Core
Required
$1,875
8
 OMC Stern (Stringer) Drive
185-230 HP 5.7L V8
New Upper 1978-85
No Core
Required
$2,116
NOTE: THESE LOWER UNITS REPLACE HYDRO-MECHANICAL VERSIONS WITH FULL MECHANICAL LOWERS. SEE INSTRUCTIONS TO ADAPT YOURS IF YOU HAVE A HYDRO-MECHANICAL UNIT.
CYL
 DESCRIPTION CORE PRICE PURCHASE
4
 OMC Stern (Stringer) Drive
120-140 HP 2.5L-3.0L
Rebuilt Lower 1978-85
No Core
Required
$1,792
4
 OMC Stern (Stringer) Drive
120-140 HP 2.5L-3.0L
Rebuilt Lower w/NEW Housing
1978-85
No Core
Required
$2,032
6, 8
OMC Stern (Stringer) Drive
170-260 HP 3.8L-5.0L-5.7L
Rebuilt Lower 1978-85
No Core
Required
$1,792
6, 8
OMC Stern (Stringer) Drive
170-260 HP 3.8L-5.0L-5.7L
Rebuilt Lower w/NEW Housing
1978-85
No Core
Required
$2,032
6, 8
OMC Stern (Stringer) Drive
170-260 HP 3.8L-5.0L-5.7L
New Lower 1978-85
No Core
Required
$2212
OMC STERN DRIVES COMPLETE
400/800 SERIES UP TO 1985
NO CORE VALUE ON ANY STRINGER DRIVE COMPONENT
STEERING INSTALLED ON COMPLETE DRIVES.
CYL
 DESCRIPTION CORE PRICE PURCHASE
4
 OMC Stern (Stringer) Drive
120-140 HP 2.5L-3.0L
Rebuilt Assembly 1978-85
No Core
Required
$3,647
6
 OMC Stern (Stringer) Drive
170-185 HP 3.8L
Rebuilt Assembly 1978-85
No Core
Required
$3,647
6
 OMC Stern (Stringer) Drive
170-185 HP 3.8L
New Assembly 1978-85
No Core
Required
$4,307
8
 OMC Stern (Stringer) Drive
185-230 HP 5.0L
Rebuilt Assembly 1978-85
No Core
Required
$3,647
8
 OMC Stern (Stringer) Drive
260 HP 5.7L
New Assembly 1978-85
No Core
Required
$4,307
OMC COBRA DRIVE GEARCASES
1986-1993
CORE VALUE AS NOTED
UPPER GEAR HOUSING ASSEMBLIES
CYL
 DESCRIPTION CORE PRICE PURCHASE
4
 OMC COBRA Drive
120 HP 2.3L
Rebuilt Upper 1986-90
$300
 $2,086
4
 OMC COBRA Drive
130 HP 3.0L
Rebuilt Upper 1986-89
$250
 $2,086
4
 OMC COBRA Drive
130 HP 3.0L
Rebuilt Upper 1990-93
$250
 $2,086
6
 OMC COBRA Drive
175 HP 4.3L V6
Rebuilt Upper 1986-93
$250
 $2,086
8
 OMC COBRA Drive
230 HP 5.0L V8
Rebuilt Upper 1986-93
$250
 $2,086
8
 OMC COBRA Drive
260 HP 5.7L-5.8L V8
Rebuilt Upper 1986-93
$250
 $2,086
LOWER GEAR HOUSING ASSEMBLIES
CYL
 DESCRIPTION CORE PRICE PURCHASE
4
 OMC COBRA Drive
2.3L-3.0L
Rebuilt Lower 1986-89
NO CORE
REQUIRED
$1,786
4
 OMC COBRA Drive
2.3L-3.0L
Rebuilt Lower, New Housing
1986-89
NO CORE
REQUIRED
$2,026
4
 OMC COBRA Drive
2.3L-3.0L
New Lower
1986-89
NO CORE
REQUIRED
$2,212
4,6,8
 OMC COBRA Drive
3.0L 1990-93
4.3L V6 1986-92
5.0, 5.7, 5.8L V8 1986-93
Rebuilt Lower
NO CORE
REQUIRED
$1,786
4,6,8
 OMC COBRA Drive
3.0L 1990-93
4.3L V6 1986-92
5.0, 5.7, 5.8L V8 1986-93
Rebuilt Lower, New Housing
NO CORE
REQUIRED
$2,026
4,6,8
 OMC COBRA Drive
3.0L 1990-93
4.3L V6 1986-92
5.0, 5.7, 5.8L V8 1986-93
New Lower
NO CORE
REQUIRED
$2,212
OMC COBRA DRIVES COMPLETE
CORE VALUE ON UPPER HOUSING ONLY
NO CORE VALUE ON LOWER
1986-91 with 1-3/16" PROPSHAFT USE #333592 PROP THRUST WASHER
1992-93 with 1-1/4" PROPSHAFT USE #126870 PROP THRUST WASHER
CYL
 DESCRIPTION CORE PRICE PURCHASE
4
 OMC Cobra Drive
120 HP 2.3L
Rebuilt Assembly
1986-89
$300
 $3,911
4
 OMC Cobra Drive
130 HP 3.0L
Rebuilt Assembly
1986-89
$300
 $3,911
4
 OMC Cobra Drive
130 HP 3.0L
Rebuilt Assembly
1990-93
$300
 $3,911
6
 OMC Cobra Drive
175 HP 4.3L V6
Rebuilt Assembly
1986-93
$300
 $3,911
8
 OMC Cobra Drive
230 HP 5.0L V8
Rebuilt Assembly
1986-93
$300
 $3,911
8
 OMC Cobra Drive
260 HP 5.7, 5.8L V8
Rebuilt Assembly
1986-93
$300
 $3,911
COBRA Outdrive Mounting Gasket Kit 85105
All COBRA except King Cobra Big Block 1986-1993
Also fits COBRA SX
(gasket not used)
$7.00
DON'T SEE WHAT YOU NEED? JUST ASK.
 QUICK QUOTE FORM

Now that you have found what you need, please order it using the shopping cart above, the secure quick order form, or call in your order. Prices iinclude shipping by FEDEX 3 day within the 48 contiguous United States only. Some bulky and extremely heavy items may incur additional charges. You will be notified beforehand if this is the case. Remember, all orders receive free technical support from the MasterTech!

  
 

Please review our Warranty, Returns & Refunds policies before you place an order.

DISCLAIMER

The information provided on these pages is correct to the best of my knowledge, however the MasterTech makes no warranty, express or implied, regarding the use of, results of, or liability created from, application of this data. This information is disseminated in good faith, however MasterTech assumes NO LIABILITY whatsoever in regard to this service. The information, software, products, and services published on this web site may include inaccuracies or typographical errors. Changes are periodically added to the information herein. Mastertech may make improvements to this site at any time. Parts ordered from this website may or may not be in dealer stock at the time of order. Thank you for reading.

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Revised 8-11-08