engineer54
New Member
I would like to fit a rev counter to the Yanmar 1GM10 diesel in my Sadler 25. I understand this should be connected to the alternator. Has anyone done this mod? - advice greatly appreciated.
Thanks
Thanks
Rev counter for Yanmar 1GM10
- Thread starter engineer54
- Start date
ianabc
Well-Known Member
As I understand it the number of teeth on the flywheel have to match the number stamped on the tachometer, usually in the centre of the dial.....
earlybird
Well-Known Member
For the GM20, and, I expect, the GM10 engines, the tacho is driven by an inductive pick-up which screws into the flywheel housing and counts ring-gear teeth, hence the previous post. AFAIK here is no dedicated output terminal on the alternator for a tacho. although someone may be able to say if perhaps the main output could be used. I think later Yanmars do use the alternator. Some time ago, PBO ran an article on making a flywheel tacho.
pete
Well-Known Member
I fitted a tiny tach to my 1GM10 simple to fit and they were very helpful.
http://www.tinytachuk.com/
pete
http://www.tinytachuk.com/
pete
ataylor
Member
Hi, Tacho is £131+vat and sensor is £110+vat. Pm me if you would like part numbers.
fireball
Well-Known Member
You can get an output from the alternator wired in which can drive a tacho .... we did this on our 2Gm20. We took it to our local alternator repair shop (does any alternator - doesn't specialise in marine) and the wire was fitted whilst M-i-L waited.
The tacho (with hours) cost around £80ish, fitted with a fuel gauge, instantly gives you much better information on what your engine is getting up to ...
The fun bit was matching up the engine speed with the tacho display - I borrowed a rev counter from work which read a reflective strip off the flywheel. Put the engine at various revs and adjusted the tacho to match - easy if you've got the right tools!!
The tacho (with hours) cost around £80ish, fitted with a fuel gauge, instantly gives you much better information on what your engine is getting up to ...
The fun bit was matching up the engine speed with the tacho display - I borrowed a rev counter from work which read a reflective strip off the flywheel. Put the engine at various revs and adjusted the tacho to match - easy if you've got the right tools!!
BrendanS
Well-Known Member
[ QUOTE ]
I borrowed a rev counter from work
[/ QUOTE ]
Strewth, how many teapots have rev counters on them? /forums/images/graemlins/smile.gif
I borrowed a rev counter from work
[/ QUOTE ]
Strewth, how many teapots have rev counters on them? /forums/images/graemlins/smile.gif
fireball
Well-Known Member
you're forgetting the engineering company .....
anyway, the teapots are no good, you need the cast iron casseroles to catch all the oil!! /forums/images/graemlins/wink.gif
anyway, the teapots are no good, you need the cast iron casseroles to catch all the oil!! /forums/images/graemlins/wink.gif
BrendanS
Well-Known Member
You have a good few gadgets that could be put to nautical uses. Might be an interesting thread! /forums/images/graemlins/grin.gif
smonard
Well-Known Member
Would it be possible to use a bicycle computer? I dont know what speed they can go up to which might be the problem. You can usually program the size of the wheel, if you could tell it the wheel is really tiny it might work.
ataylor
Member
Got a Walker Trailing Log with a cycle computer fitted to it. It was on a boat I bought some years back, not used it in a while but it used to work great.
misterg
Well-Known Member
VDO do electronic tachometers that will work off an inductive sensor if your engine already has the sensor (2 terminals on a 'thing' screwed into the bellhousing). They can be programmed for different teeth numbers, or work off the alternator, etc. Although expensive through 'normal' channels, I picked a new one up on ebay for about £30 (as part of an incomplete engine control panel). I *think* that the ones with an electronic hour meter are programmable, but, I don't understand the VDO part numbering system to be able to tell you which ones to look out for.
I much prefer an analogue dial to digital displays for this sort of thing.
(I'm still looking for a cheap sensor, though!)
Andy
I much prefer an analogue dial to digital displays for this sort of thing.
(I'm still looking for a cheap sensor, though!)
Andy
cliffordpope
Well-Known Member
The 1GM10 has no dedicated output to trigger a tachometer.
I read up the literature on alternator design and successfully soldered a wire onto the right connection inside. It now works a standard Faria tacho.
There are two calibration adjustments on the tachometer - a basic course adjustment set according to the number of windings in the alternator, and a fine adjustment to cope with the ratio of crank pulley to alternator pulley diameter.
I read up the literature on alternator design and successfully soldered a wire onto the right connection inside. It now works a standard Faria tacho.
There are two calibration adjustments on the tachometer - a basic course adjustment set according to the number of windings in the alternator, and a fine adjustment to cope with the ratio of crank pulley to alternator pulley diameter.
earlybird
Well-Known Member
[ QUOTE ]
(I'm still looking for a cheap sensor, though!)
[/ QUOTE ]
RS supplied an inductive pick-up for about £6, (5 or 6 years ago), which I fitted to my Yanmar, threaded 1/4"unf IIRC, so it needs an adapter to be made.
Corr:- RS description was magnetic pick-up, P.No. 304-166
(I'm still looking for a cheap sensor, though!)
[/ QUOTE ]
RS supplied an inductive pick-up for about £6, (5 or 6 years ago), which I fitted to my Yanmar, threaded 1/4"unf IIRC, so it needs an adapter to be made.
Corr:- RS description was magnetic pick-up, P.No. 304-166
MGambling
Member
go for a tiny tach - much easier to fit unless you want an analogue display
misterg
Well-Known Member
[ QUOTE ]
.... RS description was magnetic pick-up, P.No. 304-166
[/ QUOTE ]
Thanks for that - as it happens, I got one of them to try a few weeks ago, but made a mess of fitting it into the blanking plug (too much araldite, combined with ham-fistedness during subsequent attempts to rectify it) - good to know it works in this application, though.
(If anyone else is doing this: I drilled a clearance hole for the RS sensor through the 'blanking' plug, then counter-bored it from the top side 12mm dia to within a mm of breaking through. This lets you fit the sensor with one of the lock nuts down the counter bore, and one on the inside face of the 'plug' near the flywheel. What I should have done was test it on the engine and adjust the length sticking out before filling the counter bore with epoxy. Acording to my measurements, it needs to be a smidgen under 26mm from the tip of the sensor to the shoulder of the 'plug' for a 2GM20, but don't quote me! If you can tap a suitable thread in the 'plug', so much the better.)
Andy
.... RS description was magnetic pick-up, P.No. 304-166
[/ QUOTE ]
Thanks for that - as it happens, I got one of them to try a few weeks ago, but made a mess of fitting it into the blanking plug (too much araldite, combined with ham-fistedness during subsequent attempts to rectify it) - good to know it works in this application, though.
(If anyone else is doing this: I drilled a clearance hole for the RS sensor through the 'blanking' plug, then counter-bored it from the top side 12mm dia to within a mm of breaking through. This lets you fit the sensor with one of the lock nuts down the counter bore, and one on the inside face of the 'plug' near the flywheel. What I should have done was test it on the engine and adjust the length sticking out before filling the counter bore with epoxy. Acording to my measurements, it needs to be a smidgen under 26mm from the tip of the sensor to the shoulder of the 'plug' for a 2GM20, but don't quote me! If you can tap a suitable thread in the 'plug', so much the better.)
Andy
wiggy
Well-Known Member
Another vote for Tiny Tach, its fitted in 20 minutes and works a treat with service timers as well. FANTASTIC
ShipsWoofy
Well-Known Member
Are you still monitoring the forum, I see you have not replied as yet so I am pretty concerned about writing chapter and verse to assist you if you have no intention of returning. Otherwise I have a few bits and pieces and a bit of knowledge that will help you out.
This is not a troll, nor meant as a miserable post, I am just a little fed up from taking a few hours to help out single count posters who never respond.
J
This is not a troll, nor meant as a miserable post, I am just a little fed up from taking a few hours to help out single count posters who never respond.
J
ShipsWoofy
Well-Known Member
phew, saved myself a lot of work there.
Do you realise that the people giving you help are all human beings who have taken the time to recount their experiences and skills for free. The forum is not just a one way reference library and some feedback is not only desirable but stops you seeming like the rude person I now consider you to be.
What right do you have to expect this kind of unconditional assistance?
You have missed out on circuit diagrams of your alternators, set ups for the 1GM10 pulley system, hints on how best to connect up, photographs of the job. Your loss I feel.
Do you realise that the people giving you help are all human beings who have taken the time to recount their experiences and skills for free. The forum is not just a one way reference library and some feedback is not only desirable but stops you seeming like the rude person I now consider you to be.
What right do you have to expect this kind of unconditional assistance?
You have missed out on circuit diagrams of your alternators, set ups for the 1GM10 pulley system, hints on how best to connect up, photographs of the job. Your loss I feel.
engineer54
New Member
Thanks to everyone who has contributed to the question which I posted regarding a rev counter. Your advice and help is greatly appreciated. I am new to the PBO forum although I've been a regular contributor to various other forums and have provided advice and assistance to numerous people over the years. I have been away on business for a few days and was eagerly awaiting a chance to see the responses when I returned ...... and what a wealth of advice awaited me. Its a great pity to see what looks like a negative response. The reality of life is that some of us have high pressure lifestyles which mean that several days can pass when the demands of business mean that we can't spend time checking forums related to our hobbies. But that doesn't mean we aren't interested - otherwise, why post the question?
Anyway. to all of you who have been so helpful and informative .... sincere thanks for taking the time to help me. Hopefully I can do the same for others on many occasions in the future. And it will always be positive - our hobby is too precious to spoil by criticism of others.
Anyway. to all of you who have been so helpful and informative .... sincere thanks for taking the time to help me. Hopefully I can do the same for others on many occasions in the future. And it will always be positive - our hobby is too precious to spoil by criticism of others.