Mercury Thunderbolt model mark 58 serial no 1155298.What do I have here?

Chinewalker

Chinewalker

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Aug 19, 2001
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8,902
Re: Mercury Thunderbolt model mark 58 serial no 1155298.What do I have here?

You've got a 1958 45hp 4-cylinder, 44 cui. motor there. If it's been well maintained and cared for, you've got a real gem there. That motor was the first of over 30 years of 44-cubic inch Mercs using the same basic design, and part of over 40 years of inline 4s. Kinda like the small-block Chevies of the outboard world.<br /><br />It has a great power to weight ratio - you'd be hard pressed to find a new outboard with a better one. It's fairly basic and straighforward for servicing, although a manual is a necessity. Parts, owner's manuals and Mercury-issue service manuals are available from Grubb's Marine at www.oldmercs.com. I don't think i-boats has anything that goes back that far in their library, but it might be worth a look.<br /><br />Being that the design was around a long time, there's lots of parts out there, and lots of parts motors. If compression is good and the motor is complete, then it's certainly worth putting some tune-up time and money into... Have fun!<br />- Scott
 
Clams Canino

Clams Canino

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Jan 10, 2004
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Re: Mercury Thunderbolt model mark 58 serial no 1155298.What do I have here?

Chinewalker said everything I would have, particularly the small-block Chevy line. :D <br /><br />I have one of those too. I think he has a few of them. :) <br /><br />-W
 
Chinewalker

Chinewalker

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Re: Mercury Thunderbolt model mark 58 serial no 1155298.What do I have here?

Hi Clams,<br /> Actually, I don't have a Mark 58. Only 44s I've got are a mint pair of '66 Merc 500ELs. Lots of 40 cubers and a couple of 30s, both in racing and stock trim...<br /> I think I mighta heard the Chevy analogy on John's board awhile back and I've used it myself. Mighta been you who I heard it from :p !<br />- Scott
 
Clams Canino

Clams Canino

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Re: Mercury Thunderbolt model mark 58 serial no 1155298.What do I have here?

Originally posted by Chinewalker:<br />I think I mighta heard the Chevy analogy on John's board awhile back and I've used it myself. Mighta been you who I heard it from :p !<br />- Scott[/QB]
Click to expand...
Plagerism is the sincerest form of flattery. :D <br /><br />-W
 
H

homey58701

Cadet
Joined
Oct 7, 2012
Messages
20
Re: Mercury Thunderbolt model mark 58 serial no 1155298.What do I have here?

i just bought an old sears? fiberglass boat with a 1958 mercury mark 58 thunderbolt four motor...anyone know anything about these motors? ive seen pictures of what they look like new and it is beautiful!! id like to get it running but i dont know enough about them to know where to start..i traded the boat, motor, and trailer for a couple unfinished rc cars ($125 worth)..did i get a good deal?...any help would be appreciated..the boat year is not on the registration card so the year is unknown..but was told it is a 1954 sears fiberglass boat..its 14' and is a beautiful boat in need of restoration..the motor is all there and was told it ran a couple of years ago..
 
Frank Acampora

Frank Acampora

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Jan 19, 2007
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12,004
Re: Mercury Thunderbolt model mark 58 serial no 1155298.What do I have here?

Hey, Homey. Welcome to Iboats Forums, but you should have first read the rules. This is an 8 year old thread you have ressurected.

Try starting a new posting of your own, and you may get quicker info in the Mercury Forum
 
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