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Forum: Cooling System 07-28-2021, 09:03 AM
Replies: 2
Views: 143
Posted By Don Moyer
Removing FWC belt

OM, The brackets of most front mounted FWC belt driven pumps are mounted under the top starter mounting bolt. After loosening that single mounting bolt, you can back out the belt tensioning bolt on...
Forum: Overhaul 11-01-2020, 05:35 PM
Replies: 58
Views: 6,344
Posted By Don Moyer
Idler shaft puller

Hi Greg,

Hopefully you didn't tighten the inside part of the puller too tightly, in which case you should be able to wrap some protective material around the spindle and hold it gently with a pair...
Forum: Reversing Gear 10-07-2020, 11:23 AM
Replies: 3
Views: 629
Posted By Don Moyer
Output coupling key

Mark,

I need to back peddle on one point I made in my previous post, which was that keys up to 1.5" are OK to use between output couplings and tail shafts. This is NOT the case. The tab on the...
Forum: Reversing Gear 10-06-2020, 08:19 PM
Replies: 3
Views: 629
Posted By Don Moyer
Output couplng key

Mark,

We've seen factory installations with key lengths between 1 1/8" and 1 1/2". The key should never be more than 1 1/2" since this is the fore and aft dimension of the output coupling and the...
Forum: General Interest 09-27-2020, 11:28 AM
Replies: 24
Views: 1,940
Posted By Don Moyer
Coupling compatibility

Coupling compatibility depends on more than just the shaft diameter. The bolt patterns and facial features on the couplings are different between direct drive, V-drive, and reduction gear versions...
Forum: General Interest 09-26-2020, 09:11 PM
Replies: 24
Views: 1,940
Posted By Don Moyer
Output and prop shaft couplings

Rando,

The engine output couplings, and all of the prop shaft coupling options in our online catalog, are designed to work only on direct drive Atomic 4s.

The demand for output couplings...
Forum: General Interest 09-26-2020, 04:59 PM
Replies: 24
Views: 1,940
Posted By Don Moyer
V-drive output and prop shaft couplings

Rando; I don't see anything in your earlier reporting to indicate why you think you need a new output coupling. You apparently concluded that you needed a new prop shaft, and it appears that your...
Forum: Troubleshooting 09-18-2020, 06:19 PM
Replies: 9
Views: 8,228
Posted By Don Moyer
Valve spring material

Dave,

We questioned the manufacturer many years ago on this point, and they told us that it's normal for their stainless valve springs to have a bit of magnetic attraction. In all the years we've...
Forum: General Interest 08-30-2020, 11:11 AM
Replies: 27
Views: 3,339
Posted By Don Moyer
Fuel supply

Sorry; I muddled a point in my last post. It's very normal to bypass the oil pressure safety switch when troubleshooting a fuel pump. What I should have said is that if that's what you did, leave...
Forum: General Interest 08-30-2020, 09:51 AM
Replies: 27
Views: 3,339
Posted By Don Moyer
Fuel supply

When you test the fuel pump, make sure you test it as it is being operated during normal service. For example, if you have an oil pressure safety switch as required by the Coast Guard and you're...
Forum: General Interest 08-29-2020, 01:57 PM
Replies: 27
Views: 3,339
Posted By Don Moyer
Fuel supply

Splashlog,

Your most consistent current symptom, which has remained throughout your thread is that the engine starts and runs fairly well at idle but shuts down at higher power settings. I'm...
Forum: Ignition System 05-12-2020, 12:28 PM
Replies: 9
Views: 1,815
Posted By Don Moyer
Ignitor timing

Surcouf; I can't follow your ohms checks completely, but the fact that your engine runs at all would seem to confirm that your Ignitor module is opening and closing properly. The fact that the...
Forum: General Interest 01-10-2020, 10:18 AM
Replies: 10
Views: 1,598
Posted By Don Moyer
Ignition protection

Building on Neil's post, here's a link to one of our MMI newsletters in which we tried to explain ignition protection. The ignition protection reference comes near the end of the newsletter. Don
...
Forum: Cooling System 12-27-2019, 07:43 PM
Replies: 17
Views: 2,163
Posted By Don Moyer
Corroded stud

Thanks for the photos. I don't remember what you reported regarding the condition of the hole in the block, but it's not unusual for the threads in the block to survive at the depth where the...
Forum: Cooling System 12-26-2019, 12:28 PM
Replies: 17
Views: 2,163
Posted By Don Moyer
Thanks for the feedback

This is wonderful news! I suspect that it's too late to ask now, but did you happen to take any photos of the end of the relevant stud to show how its end looked? Studs usually have a very...
Forum: General Interest 12-21-2019, 11:19 AM
Replies: 13
Views: 2,462
Posted By Don Moyer
Thank you!

John, just to add my personal thanks along with the rest of our MMI Team for your generous sharing of your experience over a large number of years. Your contributions have most helpful to a great...
Forum: Overhaul 12-14-2019, 12:08 PM
Replies: 130
Views: 30,523
Posted By Don Moyer
Lock-n-stitch

Surcouf,

The threads on the plugs used in Lock-n-stitch repairs are tapered and shaped such that (as they are tightened) they pull the crack together. The shape of the threads was described to us...
Forum: Fuel System 12-12-2019, 04:00 PM
Replies: 75
Views: 11,700
Posted By Don Moyer
Late model carb on Palmer P60

AFisch, For whatever it's worth, and if you can't resurrect your old carburetor, we do sell a handful of new Atomic 4 Zenith carburetors to Palmer P60 owners each year, and they work fine....
Forum: Cooling System 12-09-2019, 02:25 PM
Replies: 17
Views: 2,163
Posted By Don Moyer
Manifold studs

nyvoyager,

I'm probably guilty of giving too much information. While it's true that most of the examples of this phenomenon that I can remember were from the latest engines (sheet metal flywheel...
Forum: Cooling System 12-09-2019, 07:30 AM
Replies: 17
Views: 2,163
Posted By Don Moyer
Possible good news

nyvoyager,

In later late model engines we have seen quite a few cases where what you think is a piece of stud broken off in a manifold stud hole is really nothing more than calcified residue...
Forum: General Interest 11-28-2019, 07:15 PM
Replies: 2
Views: 870
Posted By Don Moyer
Water jacket side plates

Alma,

We discontinued offering stainless water jacket side plates because we sold so few of them. We assume that folks made the calculation that the additional life expectancy of the side plate...
Forum: Cooling System 09-09-2019, 07:36 AM
Replies: 35
Views: 47,779
Posted By Don Moyer
Leaky MMI pedistal pump

Jack,

It sounds like you may have a small defect in your housing. If you give me a call at (717) 766-8777 I'll see if we can work something out to correct the problem. In the meantime, you may...
Forum: Ignition System 07-30-2019, 04:35 PM
Replies: 320
Views: 189,818
Posted By Don Moyer
Coil primary resistance

Thanks Dave, Don
Forum: Ignition System 07-11-2019, 11:28 AM
Replies: 320
Views: 189,818
Posted By Don Moyer
Coil internal resistance

Hi Dave, thanks for your explanation regarding the role of inductive resistance in the primary ignition circuit whenever the engine is running. I have a follow-up question regarding the way coil...
Forum: Electrical 05-14-2019, 05:34 PM
Replies: 25
Views: 6,034
Posted By Don Moyer
Alternator

Hello Neuse River,

In 2009 we were still using rebuilt Motorola alternators that were standard on all late model Atomic 4s from the 1970s. The only history we have as to the cause of output diode...
Showing results 1 to 25 of 500

 
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