Yanmar 3GM starter

ParaHandy

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This is a tale of pertinacity and brit upper lippiness …… aka usual guff

For two months, starting my engine has not been it’s usual self. Press the button and the starter pinion can be heard moving forward but the starter motor doesn’t turn … press it again and, usually, everything OK.

Checked all battery cabling – found the +ve battery post with these screw clamp attachment of the 10mm cable surprisingly loose – but this made no difference other than the starter motor sounding a lot healthier ….

Replaced the Perko battery switch (no longer supplied by Lawrence, rang USA who gave me tel no of ASAP supplies which was wrong) and this made no difference …

Decided problem had to be the solenoid switch on the starter. Yanmar starters don’t have a bendix ring which pushes the starter pinion (via a large helix angle thread) onto the flywheel. Yanmar use a lever, driven by a solenoid, which pushes the pinion onto the flywheel. This solenoid also has a plunger which closes the contact between the battery and the starter motor. So, the starter won’t turn until the pinion is right out (there’s another bit – the spring – which copes with the situation where the pinion can not fully engage and mesh with the flywheel ring but ignore that).

Rang the main yanmar agent – the solenoid switch is sealed, has he got one in stock? Nope, no longer supplied as separate item, got to buy the whole starter …. You must be f***ing joking, mate? Nah, nein, niente, non, nope.

Serious money are these motors to a tight git.

Tried else where and was offered one (in yen). I had found out a year ago that the USA yanmar agents are no longer allowed to supply anybody outside their area eg Florida state. As with most marine items, the dollar price delivered eg $100 is normally the same as the UK £100 which made it cheaper and, most often, quicker to deal with US.

Soddit …

Took the starter motor to bits, added a wee bit of teflon grease to the solenoid iron whats-its-name and … success .. so far ....

Hope this helps anybody else ….




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ParaHandy

Active member
Joined
18 Nov 2001
Messages
5,210
Visit site
re yanmarhelp.com ... I did post this problem there

the better discussion forum, imo, is MarineDieselDirect.com. The site went down a couple of weeks ago (it's back now) but seems to have lost all its archived info for the moment ... be a considerable loss if they can't retrieve it.

The reason that two engine forums now co-exist (they recognise each other) is because yanmar told marinedieseldirect that they could no longer sell yanmar parts outwith their designated sales territory. The MDD forum wasn't exclusively yanmar, but the majority of posts related to yanmar. With a user base whom MDD could not sell to, MDD now promote other diesel engines for whom they can do business throughout the USA and internationally and the forum is moving in the same direction. The yanmmarhelp forum is a pale imitation because it does not have the archive that MDD has (& hopefully still has) ...

One group who would have been quite pleased to see this (sales restriction) happen would have been the european dealers. None of these people, to my knowledge, made any effort to provide the service MDD did.

just a ps: when re-assembling the solenoid switch on top of the starter motor, the spring ends (2) locate in two holes in the housing and go thro' the shim .... that holds the spring and plunger together and makes re-assembly onto the pinion lever possible.


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