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Search: Posts Made By: Don Moyer
Forum: Cooling System 09-28-2022, 10:03 PM
Replies: 5
Views: 1,043
Posted By Don Moyer
MMI 502 pumps

The reason the shaft looks so different from the ones in our catalog is because the ball bearings are completely destroyed (probably from water leaking past the water seal for many years) and the...
Forum: Cooling System 07-28-2021, 09:03 AM
Replies: 3
Views: 1,790
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: 123
Views: 29,362
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: 1,486
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: General Interest 09-27-2020, 11:28 AM
Replies: 24
Views: 4,847
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: Troubleshooting 09-18-2020, 06:19 PM
Replies: 9
Views: 10,763
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, 09:51 AM
Replies: 27
Views: 8,656
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: 8,656
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: 4,042
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: 3,104
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 12-26-2019, 12:28 PM
Replies: 17
Views: 3,636
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: 4,090
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: 152
Views: 58,536
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: Cooling System 12-09-2019, 07:30 AM
Replies: 17
Views: 3,636
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: Reversing Gear 03-11-2019, 06:44 PM
Replies: 4
Views: 3,832
Posted By Don Moyer
Shifting cable size

Rick,

The original Morse 6400 series shifting cables had 5/16" X 24 male threads on their end fittings. I'm afraid it won't be all that easy to find a clevis/turnbuckle with 5/16" female threads...
Forum: Cooling System 09-26-2018, 09:32 AM
Replies: 11
Views: 3,700
Posted By Don Moyer
Suspending cores in castings

In the 1970s, foundries suspended the inner cores that formed water jackets on what looked like safety wire. Since these wires extended out through the mold, these specific areas were reinforced...
Forum: Cooling System 09-25-2018, 04:52 AM
Replies: 11
Views: 3,700
Posted By Don Moyer
Leak in valve chamber

In each of the 3 or 4 cases that we've seen these leaks ourselves, Universal had drilled and tapped the flaws to 1/4" NPT pipe threads and then installed an Allen headed plain steel pipe plug. The...
Forum: Ignition System 08-25-2018, 09:43 AM
Replies: 5
Views: 2,394
Posted By Don Moyer
Azazzera. Since you asked, here's a link to an...

Azazzera. Since you asked, here's a link to an online calculator that will help you determine the way resistance varies with temperature: http://www.endmemo.com/physics/resistt.php You basically...
Forum: Introductions 08-10-2018, 05:35 AM
Replies: 24
Views: 10,983
Posted By Don Moyer
Coil wires

Terry, assuming that you have an Ignitor electronic ignition system, make sure it's the red wire from the distributor that connects to the positive of the coil and the black wire to the negative. Don
Forum: Fuel System 06-20-2018, 11:23 AM
Replies: 49
Views: 14,584
Posted By Don Moyer
Oil consumption

We have very little history of unusually high oil consumption being reported. In case it helps your perspective, I can report that before I rebuilt it, the Atomic 4 in our first sailboat (our...
Forum: Cooling System 06-02-2018, 10:03 AM
Replies: 6
Views: 3,242
Posted By Don Moyer
Water passageways in heads

Universal changed the coolant flow pattern somewhat over the years between the block and the head. They did this by eliminating certain holes in the head. Hole patterns in MMI heads reflect the...
Forum: Cooling System 05-08-2018, 07:03 AM
Replies: 56
Views: 27,486
Posted By Don Moyer
Cooling system troubleshooting

There are almost too many really great troubleshooting suggestions in these recent posts to keep track of!! Thank you Cajun Spike, Tenders, sastanley, to name just a few. Don
Forum: Exhaust System 09-03-2017, 05:18 PM
Replies: 7
Views: 3,332
Posted By Don Moyer
Exhaust leak

Hi Mary, I don't see where anyone has asked if the coolant level in your FWC system is going down in your expansion tank. Or, if you're using a colored antifreeze, does your leak look like that...
Forum: Ignition System 06-28-2017, 12:50 PM
Replies: 7
Views: 3,601
Posted By Don Moyer
Ignition issue

Al, you're raising a very interesting question! You're correct in pointing out that both the primary and secondary windings of the coil share the negative terminal for their ground (through the...
Forum: Troubleshooting 06-26-2017, 05:31 AM
Replies: 27
Views: 7,119
Posted By Don Moyer
Water in oil

I need to correct something I wrote many years ago. We used to think that the weep holes in Oberdorfer and MMI flange pumps were large enough to eliminate the possibility of water getting into the...
Showing results 1 to 25 of 122

 
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