Author Topic: ALMA's trusty Atomic 4 out for first overhaul  (Read 634 times)

Alma

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ALMA's trusty Atomic 4 out for first overhaul
« on: December 01, 2019, 02:40:18 PM »
We got ALMA's Atomic Four out of the boat without any issues last week.

We used the technique shared by vessel CHANCE #10 and it worked perfectly!

Now the venerable marine engine is in my workshop and getting the royal treatment.


T_schlueter

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #1 on: March 19, 2020, 04:37:11 PM »
I hadn't thought about removing utensil box to access engine. Good to know.
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T_schlueter

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #2 on: November 19, 2020, 10:42:31 AM »
My Atomic 4 is setting on salon floor.  Picking it out tomorrow with a crane.  I'm on a cradle and am not comfortable trying to use the boom to lower it to the ground.  It seems like too much weight pressing down on the rear cradle pad.  I've had "oil-canning" issues in the past as it is.  I left the V-drive attached.  I see you removed yours.
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Alma

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #3 on: November 19, 2020, 05:19:11 PM »
We didn't use boom to lower to ground- just to get it into cockpit.

Then we had yard pick it from the cockpit with a jury-rigged setup on the travel lift.

The load is on the mast and topping lift and halyards not the boom.

I've seen an Atomic Four pushed up an extension ladder into the cockpit with 3 strong folks.

If you have access to a crane to lift from salon floor that should be cake.

Good luck with your build- Alma's A-4 runs much better than new.

.010 over pistons and CNC bored cylinders make for a better block than what came out of the factory.

Even with many NOS parts from eBay the cost was over $1500.
Pistons, rings, valves, guides, crank and cam polished, valve seats cleaned up and balancing...

IT was a real Covid-Project last Winter and Spring. It kept me out-of-trouble.








T_schlueter

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #4 on: November 19, 2020, 05:40:05 PM »
Thanks for the info.  The crane is $107 plus I may have to pay a guy to operate it.  I may consider using a halyard/boom setup to put it back in.  I may scrounge up a few jack stands to ease the pressure on the cradle pad.  Looks like I'll have to remove the V-drive in order to attach the engine stand I just bought.
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Alma

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #5 on: November 22, 2020, 12:31:11 PM »
Yes- I paid $100 each way and was happy to do so.

We already had a system to get it into the cockpit and when finished back into the salon.

I have a generic engine stand and an adaptor for my 911 engine- I never saw an elegant way of attaching the A-4.

I stripped the A4 on a pallet style fixture on the floor and went from there on my bench.

You may have trouble finding a competent machine shop- I did. When I was young there were auto machine shops in every town... Now not so much. Make sure they have experience with small cylinders. I got into a speed shop and they did a lot of motorcycles so they had fixtures for the tiny A-4 cylinders. The result was spectacular.

I got the genuine NOS Universal pistons on Ebay at half price-  Popular A-4 parts houses sell after-market. Be sure to match them when they arrive- I waited and one was different- Luckily the seller had a few and was happy to send me a match. One was curiously 180 degrees different- crazy. I never saw anything like it- It had its own different part number suffix.


T_schlueter

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #6 on: November 22, 2020, 10:56:57 PM »
I removed the flywheel/bell housing and tried attaching my stand to that end.  The shaft flange got in the way and the bell housing bolt pattern was so narrow I couldn't manipulate the stand arms enough to attach them. I had to make an adapter out of 3/4in. plywood to interface between the engine and stand. So far so good!  I want to be able rotate it upside down to remove crankcase pan for easy access to connecting rods.
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Alma

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #7 on: November 23, 2020, 06:56:46 PM »
Sounds good!

T_schlueter

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #8 on: November 25, 2020, 07:58:26 AM »
I've attached a picture of my head.  There are five coolant holes that seem to be filled in somehow.  I don't think they are simply plugged up with gunk.  I tried drilling one out and just hit metal.  I circled the holes.  Does this sound right?  Also, how did you get the studs out?  I've tried double nutting without success.  I'll look for a stud remover sometime today to see if that works as well as some YouTube vids make it out to be.
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Alma

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #9 on: November 26, 2020, 02:30:25 PM »
I can't see the detail in the picture. If you hit metal stop and investigate.

You'll need some patience with the studs if this is their first time out.

It's worth taking a break and ordering some Aero Kroil.

Then use a little Kriol, tap on them lightly to distribute and wait.

If you can borrow or buy the genuine Snap-On collet stud remover that's the best tool. Pricy.

I had success with the double nut and also additionally a vice grip on the stud. Bottom line is you will want to release the corrosion before you get a tool that has the grip to gall or tear the stud.

It is counterintuitive which of the doubled nuts to apply torque to to get the most grip without slippage. Test and experiment. It is a 25/75 difference.... Amazing.

And patience, Aero Kroil and a little tap tap tap to distribute and patience is the best way to get the studs out with minimal damage to the block.

Patience being the most important.

Remember fumes from a torch (not recommended) burning Kroil or any other rust-buster are very toxic.
« Last Edit: November 26, 2020, 02:48:56 PM by Alma »

T_schlueter

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #10 on: November 26, 2020, 10:10:58 PM »
A collet stud remover worked like a charm!  Pistons and valves are out. Pistons and rings seem to be in decent shape. Valves are very sooty. Micrometer readings indicate minimal wear. I may have an expert take a look. I've reached a point where I'm quite unsure how to proceed.
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Alma

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Re: ALMA's trusty Atomic 4 out for first overhaul
« Reply #11 on: November 27, 2020, 04:08:06 AM »
Good news. Your machine shop can make the measurements and guide you.