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TOPIC: '57 Merc Refresh

'57 Merc Refresh 28 Aug 2019 16:02 #98652

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HawkEyes wrote:

Moe wrote: Duly noted. I have a cyl hone somewhere . . . .
I'm not sure if my service manual specs out psi readings, will have to check.
Either way, rings can't be too pricey, as long as the pistons are in decent shape. I'm sure new replacements don't grow on trees.


Joe Poole will have them for you. Ferguson Poole Marine


Yeah I figured I'd be calling him at some point.

Joe! If your reading this I'll probably be buying more parts!

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'57 Merc Refresh 27 Aug 2019 22:19 #98618

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Dang Russ, that was a sad story. :( What did you do with the motor afterwords?

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Mercury Marc, 1958 Hawk II. 1961 Merc 400

'57 Merc Refresh 27 Aug 2019 21:32 #98614

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I had a Mark 58A stop running in the barrel. It was the first start of the year and it ran for about ten seconds. The motor locked up. I pulled it apart to find one of the bearing needles had broken and decided to join in with the piston. It probably dried out from sitting and sucked up to the cylinder. The cylinder and piston were scored beyond repair. I checked other bearings with a 5x and my reading glasses and they were all pitted. At the time I was building a Mark 25 so I checked those bearings and they were pitted as well. Just be glad it hasn't sucked up a needle like mine did, live and learn I guess....

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The Rivethead formerly known as Russ

'57 Merc Refresh 27 Aug 2019 20:18 #98610

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Moe wrote: Duly noted. I have a cyl hone somewhere . . . .
I'm not sure if my service manual specs out psi readings, will have to check.
Either way, rings can't be too pricey, as long as the pistons are in decent shape. I'm sure new replacements don't grow on trees.


Joe Poole will have them for you. Ferguson Poole Marine

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Mercury Marc, 1958 Hawk II. 1961 Merc 400

'57 Merc Refresh 27 Aug 2019 16:15 #98606

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Duly noted. I have a cyl hone somewhere . . . .
I'm not sure if my service manual specs out psi readings, will have to check.
Either way, rings can't be too pricey, as long as the pistons are in decent shape. I'm sure new replacements don't grow on trees.

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'57 Merc Refresh 26 Aug 2019 19:41 #98591

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If you have the motor that far apart I would replace the rings. Don't forget to deglaze the cylinders with a hoan before installing the new rings. 100 PSI per cylinder isn't very good. I have seen compression readings as high as 150 PSI on a Mark 58.
The following user(s) said Thank You: VinTin, SeanDrives4Fun

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John

1958 Vagabond II & 35 HP Evinrude
1955 PlastiCraft 12 Ft. Delux Runabout
1957 Clipper & twin 35 HP Evinrudes
1957 AlumaCraft 14 Ft. FD

'57 Merc Refresh 26 Aug 2019 17:10 #98586

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I did check the crank for endplay and it was within the manual specs. Any reason I can't reuse the rings or should I replace those while I'm at it? I've got 100 psi even on each cylinder.

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'57 Merc Refresh 26 Aug 2019 15:40 #98583

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Moe wrote: Well I've already had this torn down to basically a short block. The one thing I didn't touch was the bottom end bearings. Lesson learned I guess.


I had to add couple shims to keep everything aligned properly, using a feeler gauge of course.

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Mercury Marc, 1958 Hawk II. 1961 Merc 400

'57 Merc Refresh 26 Aug 2019 11:18 #98579

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Well I've already had this torn down to basically a short block. The one thing I didn't touch was the bottom end bearings. Lesson learned I guess.

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'57 Merc Refresh 24 Aug 2019 23:44 #98546

The good news is no valve train to mess with, the bad news is everything is on lose roller bearings except the top and bottom bearings.
Keep track of the bearings and don't mix them if you can manage it. don't mix the shims in the sides of the piston pins or anything else like that.
If you don't have a manual buy a Mercury Factory service manual, it's worth every penny.
Pay close attention to the water tube.
Expect to break a few bolts, heat is your friend!

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Ray

"Every man takes the limits of his own field of vision for the limits of the world."
Arthur Schopenhauer

1956 Vagabond I - 50 HP Johnson
1950 Flyer - 50 HP Evinrude
1/2-195something Flash - KG7
1956 Golden Rocket, Sawzall Special
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