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4 Engine Coupler Failures, Why???

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Old 05-30-2007, 03:13 PM
  #21
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From a machining standpoint...how about checking the alignment when rotating the engine every 90*? maybe the coupler is crooked....internally...they could be aligning it as it sits...but as soon as the engine starts the runout will kill everything if its crooked....just a thought
Both of them? Twice?
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Old 05-30-2007, 03:31 PM
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Both of them? Twice?
i dunno.....defective production run????
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Old 05-30-2007, 04:28 PM
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Do the props have rubber hubs too? Or are they solid?
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Old 05-30-2007, 04:54 PM
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There is a newer 500 efi in a local shop that blew the couplers a couple of times. Turned out that the coupler that bolts to the flywheel was machined way off center from Mercury. If that is the case, Mercury should warrantee it.

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Old 05-30-2007, 05:13 PM
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Both of them? Twice?

That's the thing most are overlooking here.

My guess is they were off to begin with (it happens, even with offshore mounts) and the mechanic either didn't check the alignment because of the thinkng they were offshore mounts= pretty reliable, or the owner does hammer it hard.
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Old 05-30-2007, 09:02 PM
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Do the props have rubber hubs too? Or are they solid?

No.I have only seen solid hubs on XR drives. The bronze hub with the teflon strips


he has 2 sets of merc lab props. It is not the props.........


US1 Fountain I am betting the same thing,to lazzy to ck


Wobble I figure the about .100 thou . ya never know they might of use a fork lift to push the on


Cuda I didnt look or ask it rubber was every were or smelt burnt.

Thanks again for the input.....

rob
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Old 05-31-2007, 08:14 AM
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[QUOTE=Griff;2144574]I would also replace with the HD couplers used on the 575sci and up-#21 in the diagram.

That's what I'm thinking. Did the repair shop install the cheap generic crap you can get off the internet or genuine Merc HD couplers?

Transom or stringer failure could play in also but like was said before, the age of the boat should rule that out.
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Old 05-31-2007, 11:04 AM
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No.I have only seen solid hubs on XR drives. The bronze hub with the teflon strips


he has 2 sets of merc lab props. It is not the props.........


US1 Fountain I am betting the same thing,to lazzy to ck


Wobble I figure the about .100 thou . ya never know they might of use a fork lift to push the on


Cuda I didnt look or ask it rubber was every were or smelt burnt.

Thanks again for the input.....

rob
Rob, please let us know how this is resolved, something strange is going on
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Old 05-31-2007, 12:29 PM
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No.I have only seen solid hubs on XR drives. The bronze hub with the teflon strips


he has 2 sets of merc lab props. It is not the props.........

if he spun hubs and you said that he got caught in some brush then those props and drive system took some serious trauma, if the motor was turning to the point that the hubs spun look for the weakest link in the system from the coupler to the prop.

sounds like he tried to power out of the brush.
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Old 05-31-2007, 01:30 PM
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if he spun hubs and you said that he got caught in some brush then those props and drive system took some serious trauma, if the motor was turning to the point that the hubs spun look for the weakest link in the system from the coupler to the prop.

sounds like he tried to power out of the brush.
They said he got caugt up on a limb/brush etc and tried to get on plane 3 time and put it in reverse and it came off It ran the rest of the day and on the way home it blew out.

This time he was going across lake mapeu,la and it let loose a again. He idled about 5 mile and it got back up on plane then went out again after about 5 min's

Wobble I will post whta they find

Croozin2 theres no telling what they put in it .Do they make a no name generic hub?
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