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BMC 1500 starter motor sticking


Jak

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For the second time this weekend I've had to persuade the starter motor to work with a big spanner. So sounds like time for a replacement. 

Can any of you (I admit I'm thinking of Tony) help with a suggestion of the best replacement and where to get one?

thanks in advance for your help as ever.

Jak. 

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2 minutes ago, Jak said:

For the second time this weekend I've had to persuade the starter motor to work with a big spanner. So sounds like time for a replacement. 

Can any of you (I admit I'm thinking of Tony) help with a suggestion of the best replacement and where to get one?

thanks in advance for your help as ever.

Jak. 

Calcutt used to be the place?

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3 minutes ago, Sir Nibble said:

Think I've got one round the ex wife's refurbed by my own fair hand. I will see if I can get it.

Incidentally Snibs. Is the company called ''Intermotor'' still going? I think it is.  The company who sell vehicle electrical bits and bobs, brushes, sensors, relays ect, ect, very, very useful. They came in small blue boxes.

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17 minutes ago, Sir Nibble said:

Think I've got one round the ex wife's refurbed by my own fair hand. I will see if I can get it.

That sounds promising!  Please PM me and let me know what you want for it :)

 

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A sticking starter motor is fairly common on the BMC1.5 especially if it has been there for many years, having said that re-conned ones ca do the same, as i found out. If all else fails try Jonathon (Johnno) Hewitt at Union Canal Carriers in Braunston. He sometimes has some in stock, and if not can probably get (and fit) one for you.

His contact number is 07885 245374 Tell him I recommended him, he may say something rude, but I am sure he will help if he can. The only thing is, you may need to get your boat to him for him to fit it.

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4 hours ago, Jak said:

For the second time this weekend I've had to persuade the starter motor to work with a big spanner. So sounds like time for a replacement. 

Can any of you (I admit I'm thinking of Tony) help with a suggestion of the best replacement and where to get one?

thanks in advance for your help as ever.

Jak. 

You've not got the right tool/persuader., use a hammer.

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I would sat Calcutt or any auto electrical specialist.

If hitting the motor cures it for a (short) while I would expect a worn or sticky brush  or possibly a sticky solenoid armature (moving steel slug) but it could also be low voltage for some reason (including worn ign sw. internally, undersized solenoid cable etc).

With the motor off the solenoid body should  draw off the armature by taking off the solenoid to motor link, removing the two screws from in line with the solenoid in the drive end bracket and just pulling the body off the armature. mark the body so it goes back the right way up - if not it is likely to machine gun and not start.

The brushes are a bit more difficult to get at and a lot more difficult to change. There is either a band around the motor body secured by just one clamping screw or a slightly domed cover held in place but 2 nuts. Once the cover or band are off you should see how worn the brushes are, if any of the snail brush springs are broken or any brushes are sticky. A little hooky tool to lift the brush springs is useful.

 

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4 hours ago, Sir Nibble said:

Embarrassed squirming time. Sorry, it's for an 1800.

Thanks for all the helpful replies. I planned to remove and replace myself, though it looks very tight and will have to figure out what else to remove to get to it. 

One of the terminals to the motor is a little lose, but I've struggled to get a spanner to it. Could this be the problem?  I had assumed it was a brush or armature but you mention low  voltage...

 

 

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On 13/08/2017 at 12:03, Jak said:

For the second time this weekend I've had to persuade the starter motor to work with a big spanner. So sounds like time for a replacement. 

Can any of you (I admit I'm thinking of Tony) help with a suggestion of the best replacement and where to get one?

thanks in advance for your help as ever.

Jak. 

 

Do you hear a 'clunk' and then nothing?

Or just silence?

If a massive clunk then it can be the solenoid contacts, especially if they've been submerged (don't ask!), or the brushes.

If silence then a bad connection, and perhaps worth a tighten up of the spade connector on the solenoid?

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On my 1.5 i get a clunk on the turn of the key, its a bit frustrating when it happens, it may even do it 3 or 4 times before actually firing and starting.

I actually think its getting better at turning over through use. The boat was moored up in a marina for many years without use

.perhaps in a few more weeks the stickyness on the turn of the key may be eliminated altogether by virtue of using the boat .

I can only hope because i dont fancy taking the starter and solenoid off its difficult to get at in my boat.

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5 hours ago, Mikexx said:

 

Do you hear a 'clunk' and then nothing?

Or just silence?

If a massive clunk then it can be the solenoid contacts, especially if they've been submerged (don't ask!), or the brushes.

If silence then a bad connection, and perhaps worth a tighten up of the spade connector on the solenoid?

Silence can also be brushes. The pull in coil in the solenoid runs to negative through the starter motor itself so a poor brush contact can prevent it pulling in.

44 minutes ago, Karen Lea Rainey said:

On my 1.5 i get a clunk on the turn of the key, its a bit frustrating when it happens, it may even do it 3 or 4 times before actually firing and starting.

I actually think its getting better at turning over through use. The boat was moored up in a marina for many years without use

.perhaps in a few more weeks the stickyness on the turn of the key may be eliminated altogether by virtue of using the boat .

I can only hope because i dont fancy taking the starter and solenoid off its difficult to get at in my boat.

If this were mine I would locate the SINGLE THIN cable on its own small solenoid connector and take it off. Then male contact between that small terminal on the solenoid and the big thick terminal that comes from the battery. An old screwdriver will usually do but do not let it touch any other metal. If the motor turns over every time you make contact then the problem is in the ignition switch or wiring. From what you say I think there is a fair chance the switch may be the problem and it is possible it will clean itself with use but do not hold your breath. It could also be undersized wiring between switch and that small terminal.

If the motor does not run each time the it is likely to be dirty contacts in the starter solenoid or one of the other things discussed in this thread.

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