Pretty early mark 30

Mercury Outboard  general discussion

Pretty early mark 30

Postby mark 55 » Mon Nov 12, 2018 4:50 am

Today I bought a tiller model mark 30. PO says the id plate was missing when he bought it. Says he never ran the motor. Compression is between 105 and 110 all 4. The serial number is not stamped on the top of the block like mark 55s. I found this number on the edge of the block near the water jacket. #950097 The white papers say made in 1955? But it would be a 1956, right?

Mag gives no spark. Are these about as hard to remove as they are on the mark 55? Assuming they would be but hoping they're easier. See anything missing from the pics? Motor was originally the dark and light blue. Why someone would want to paint it black is beyond me. Tower of power envy I guess. Skeg looks like it may be a repair? It's not shaped like I thought it would be like the rounded skegs on mark 55s, etc

Any info or tips would be appreciated.

Thanks!
Scott
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Re: Pretty early mark 30

Postby Fingerlakeskid » Mon Nov 12, 2018 5:26 am

Scott, not to burst your bubble, but the mag on a tiller Mark 30 is worse than that of a Mark 55 to pull. The lower pan and the tiller linkage both interfere with the mag cap not allowing the mag to be dropped far enough to disengage the driveshaft. You might better plan on loosening the block to pan mounting bolts to give you some room.
Stan Augustine

Mark 30 tiller,  (2)Mark 55, Mark 58A (2)Merc 200 FGS, Merc 450, Merc 500.  1950 CZT Penn Yan Swift, 1957 Alumacraft FD, 1985 Larson Senza w/Merc 1150,
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Re: Pretty early mark 30

Postby mark 55 » Mon Nov 12, 2018 5:40 am

Thanks for the heads up Stan!

And thank you Carl Kiekenhofer-weisenmiller-schlitzulaufen!!  :D
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Re: Pretty early mark 30

Postby mercaholic » Mon Nov 12, 2018 2:18 pm

Fingerlakeskid wrote: You might better plan on loosening the block to pan mounting bolts to give you some room.


Stan's suggestion is good.

If the base gasket is in reasonably good condition, you can jack up the front of the p/head by about a quarter inch by loosening the pan mount bolts.  This will allow the magneto to drop enough to slip out without releasing all the shift linkage components.

Alternatively, pulling off the powerhead will allow you to full access to the magneto's removal and you can also check the driveshaft splines and grease them up for a refit.
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Re: Pretty early mark 30

Postby Tom Brockmeyer » Mon Nov 12, 2018 2:21 pm

Well, Scott, let spitdoc (Bill H) know you bought the $150 Mark30 I pointed him towards!

I have a couple Mark30 serial plates you can choose from if you want (free).  Just got them in a big box of parts a few weeks ago and have no use for them.

The mag comes off EASY...  While you have the powerhead out for a peek inside to inspect the crank & rods condition!   [wrench.gif]
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Re: Pretty early mark 30

Postby ctpdsr » Wed Nov 14, 2018 12:24 am

Bingo Tom.

=======================================================================

Scott,

Take lots of photos and make notes with regard to all that Rube Goldberg linkage. As was the case with the early MK55 production runs, the early MK30 powerheads had “dark” treated blocks. Unlike the 55H, the 30H block was a standard service powerhead. That being said, guys coveted the early dark blocks for Stock racing builds. Consistent ports, straight bores, etc... when the tooling was new.

Oh, I also know a guy that's really good at rebuilding FMC mags...

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Re: Pretty early mark 30

Postby ctpdsr » Wed Nov 14, 2018 6:31 pm

Did some additional research. Oldmercs shows the initial production run in 1956 included #s 943251-997919. My guess this is the batch guys liked to source for C-Stock. Again, their is nothing magic about a 30H serial # block other than historical interest. The 55H blocks were machined differently with higher port timing and enlarged carb openings to accept Carter/KA Tillotson carbs. Another point of interest. At some point in 1958, the last of the MK30 blocks and later MK55 blocks converted to the two-port cover design casting. Blocks were painted silver. The 40 cid blocks lived on in 1959 as white Merc 300 & 350 models, while the 30 cid block went away. If you were a C-Mod racer, this later "Siamese" port cover design was the ticket. I can't imagine there are many of these still out there in service trim.

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Re: Pretty early mark 30

Postby mark 55 » Sun Mar 17, 2019 11:52 pm

Thanks for that info Chuck! I didn't see that last reply until today when I searched out this old thread.

I had put this motor away for the winter (which is exactly the perfect time to have pulled the power head and gone through the magneto..... :roll: ) but now with the return of good garage weather I am back on it.

In looking at the pictures I took today, it appears I'm missing a ground wire? Is it possible that is why I have no spark? I will go ahead and pull the power head to do as much due diligence as possible. I have the big pre-1965 manual so I will do some reading. Will I be able to use my nice power head stand that I had made to accommodate the mark 55s, etc? or is the drive shaft splined differently?
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Re: Pretty early mark 30

Postby mark 55 » Mon Mar 18, 2019 12:03 am

Here's the stand I had made.
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Re: Pretty early mark 30

Postby ctpdsr » Mon Mar 18, 2019 1:17 am

That looks like a 40/44 shaft size. The crank in a MK30 looks the same as it's brothers EXCEPT for the smaller shaft size. The tower and gearcase are similar to a MK20. The lower cowl pan on a service MK30 acts as an adapter plate between the tiny tower and 4-cylinder powerhead. This is not needed in for a 30H as the tower gasket pattern is the same as a 55H. Since I do not build a ton of 30H powerheads, I found a factory vice-mounted deal that does the job (**see photo). You can see the large end of the tool is pointing down. Your mag is most likely dirty and has a rotten condenser. I think you need to stick to the FMC version as a Merc Mag will not fit into that Rube Goldberg linkage. Again, not a problem on a 30H and most guys did upgrade to the Merc 4D-3,4,5 mags.


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Re: Pretty early mark 30

Postby mercaholic » Mon Mar 18, 2019 2:11 am

mark 55 wrote: it appears I'm missing a ground wire? Is it possible that is why I have no spark?


Actually if it had a ground wire attached and the motor had no spark, that may be a possible source but without a wire in place, chances are the problem of no spark could originate within the magneto.

Also, check for continuity thru the spark plug wires.  My Mk30 ran well until it warmed up then developed an ignition miss due to poor spark plug wires.
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Re: Pretty early mark 30

Postby mercules » Mon Mar 18, 2019 4:09 am

All the grounds are there, the side terminal is for the kill wire that grounds thru the key and the metal plate is for a clamp that holds the wire.
Let's fix it now - before we launch the boat.
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Re: Pretty early mark 30

Postby Fingerlakeskid » Mon Mar 18, 2019 6:43 am

Pull the mag and go thru it. Now is the time.
Stan Augustine

Mark 30 tiller,  (2)Mark 55, Mark 58A (2)Merc 200 FGS, Merc 450, Merc 500.  1950 CZT Penn Yan Swift, 1957 Alumacraft FD, 1985 Larson Senza w/Merc 1150,
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Re: Pretty early mark 30

Postby mark 55 » Mon Mar 18, 2019 12:07 pm

Man did that power head come off hard. Seemed harder than the 40/44 power heads I have removed. Anyway, here it sits on a nice stand I bought after seeing Chuck's.  icon_thumbup.gif

Will remove the magneto and go through it as advised. Other than the magneto, what else should I be looking for at this stage. I'd rather not go all the way down with this one because the compression numbers seemed good-altgough I'm sure that would ultimately be the best approach.

I wasn't looking for this motor (dumb thing to say :lol: ) but I couldn't pass it up. I have a really nice original mark 30 (thanks George!) and I love the way it runs. This one has a tiller and so it was just too hard to say no. It will need a full cosmetic resto but that is a ways off. Too many other projects ahead of it. Can anybody else relate?  

Thanks for any advice!
Scott
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Re: Pretty early mark 30

Postby ctpdsr » Mon Mar 18, 2019 4:32 pm

If you are keeping the case together, you are left with the mag, carbs (always new solid brass seats from Mercury), fuel pump kits from Mercury and fuel lines. A new timing belt is never a bad idea. Note the 30H ran with a single fuel pump and cover plate over the lower mount. The factory was worried about extended low speed idle given the low displacement. Not an issue for race applications. Happy to help with the carb/mag rebuilds and timing set if needed.


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Re: Pretty early mark 30

Postby mark 55 » Mon Mar 18, 2019 6:21 pm

Chuck said: Note the 30H ran with a single fuel pump and cover plate over the lower mount. The factory was worried about extended low speed idle given the low displacement. Not an issue for race applications.

I wondered why this one had two fuel pumps. Can't remember on my other mark 30 but I believe my mark 55s only have one fuel pump. Thanks for the info ffer on the timing etc Chuck! I will probably take you up on that offer!
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