Oil Pressure sender . YANMAR . 4 L HASTE.

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oldgit

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Wanted.
After market alternative to the impressively priced Yanmar oil pressure gauge sender unit on my boat.Not the oil pressure warning switch.
Appears to be same item on all their range of engines including the 4 and 6 cylinder units.
Quite a common problem but nobody seems to to have solved the problem of sourcing a non genuine replacement.
 
oldgit said:
Wanted.
After market alternative to the impressively priced Yanmar oil pressure gauge sender unit on my boat.Not the oil pressure warning switch.
Appears to be same item on all their range of engines including the 4 and 6 cylinder units.
Quite a common problem but nobody seems to to have solved the problem of sourcing a non genuine replacement.
Click to expand...
I would take one into a motor factor who supplies the motor trade with such items. They might be able to identify it. I have used such a company in Scotland where even the MD2B appears on their computer.

some one like this.

https://www.autodoc.co.uk/car-parts...HrczW4cuBwvSF8BjeVqUVaAisLr9LF0oaAq91EALw_wcB
 
oldgit said:
Wanted.
After market alternative to the impressively priced Yanmar oil pressure gauge sender unit on my boat.Not the oil pressure warning switch.
Appears to be same item on all their range of engines including the 4 and 6 cylinder units.
Quite a common problem but nobody seems to to have solved the problem of sourcing a non genuine replacement.
Click to expand...
Are the senders particularly unusual.....https://www.furneauxriddall.com/pages/marine-gauges-accessories
 
Best to measure the sensor output resistance on a working sensor with all wires disconnected from the sensor:
There are two different sensor output ranges, euro type is 10 ohms at zero pressure, 180 ohms at 80 psi.
US version is 240 ohms at zero pressure and 33.5 ohms at 80 psi.
Dual station sensor is half the above resistance value.
once that is determined you just need to match the thread size and no of connections, one or two and the max pressure.
Happy to help you search if you can advise on the above.
 
ChromeDome said:
Doesn't look too eye watering ? (if this sender/switch is the right part)

Oil Pressure Sender/Switch for Yanmar 1GM, 2GM, 3JH, 4JH, 4LH, marineparts.eu

Oil pressure sender for Yanmar 1GM 2GM 3GM RO : 124060-39452
Click to expand...
That is a switch for the low oil pressure alarm.



The sensor for the oil pressure gauge is this little solid 22 carat gold diamond encrusted beasty. :)
1657558499956.png
It has absolutely nothing stamped on the casing and to date it appears that nobody on the boaty internet has found a more modestly priced sender suitable to match the gauge.
They do have a notorious reputation for giving inaccurate readings with age.
It would appear that some folks have resorted to replacing both the Yanmar gauge and sender with after market items to save money.
Twin engined boat will measure the ohms on the "good" sender .

Fortunatly it is a single station, with simply a low pressure alarm on the flybridge.
 
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oldgit said:
That is a switch for the low oil pressure alarm.



The sensor for the oil pressure gauge is this little solid 22 carat gold diamond encrusted beasty. :)
View attachment 138410
It has absolutely nothing stamped on the casing and to date it appears that nobody on the boaty internet has found a more modestly priced sender suitable to match the gauge.
They do have a notorious reputation for giving inaccurate readings with age.
It would appear that some folks have resorted to replacing both the Yanmar gauge and sender with after market items to save money.
Twin engined boat will measure the ohms on the "good" sender .

Fortunatly it is a single station, with simply a low pressure alarm on the flybridge.
Click to expand...
is this something like what you require.....
VDO Pressure sender 0-10 Bar – R1/8 DIN 2999
it has 1/8" BSPT thread which I believe is the Yanmar norm and has the Euro resistance output. You would need to verify if you need the Euro or US gender on this point!
 
Looks remarkably similar to the existing unit.
................going to look for a UK based source.
Going to check for Euro /US specs today
 
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oldgit said:
Looks remarkably similar to the existing unit.
................going to look for a UK based source.
Going to check for Euro /US specs today
Click to expand...
You should also shop around as the more common 1/8" NPT is often found much much cheaper and can easily be fitted by the use of a simple male / female adaptor, as can all of the other various thread types.
 
oldgit, clean (as in scrape carefully the paint off!) the hex on your existing one. If it's a VDO (90% sure it is!) then there will be markings there. bar range at least. Check it out.
I'd go for the one ean_p points above.
Ah, a giveaway will be the brand of the gauges on lower helm, what are they?
sender should be less than 100euro.
 
assuming it is VDO, I had a thread a few years back on issues of inaccuracy NOT coming from the sender, but from the "regulated" current they were getting from the gauge. Had to replace some trims/resistors and everything was back to normal.
 
Removed both senders
........................................................both indicating 89 ( ohms ?) on my budget multimeter .
Pretty certain the oil pressure gauges are not VDO.
 
OK, asuming the problem is not on both gauges/engines
spare your money, get new temp external cables from senders to gauges and see what happens
before doing that, check the connectors for corrossion and clean the lot carefully.
yes, these are not VDOs, senders may well be though.

if the senders are absolute value then at sea level they'll be measuring 1bar, doubt that would be 89Ω in either US or EU format. Try a better meter! Alternatively check VDO senders specs, they provide Ohm/pressure tables for comparison
 
Struggling to get much information on what input range those gauges use. 89 ohms is definitely not either of the 2 normal ranges but could be close to a 2 station US version which is 120 ohm at zero pressure. Normally these senders would be setup as zero at atmospheric pressure. Do either gauge work? What are the issues?
 
Bran said:
Struggling to get much information on what input range those gauges use. 89 ohms is definitely not either of the 2 normal ranges but could be close to a 2 station US version which is 120 ohm at zero pressure. Normally these senders would be setup as zero at atmospheric pressure. Do either gauge work? What are the issues?
Click to expand...
One of the engine gauges is displaying low oil pressure at idle.
A search of the internet brings up many examples worldwide of this particular phenomenon :) which is usually solved by simply replacing the old sensor with a branded Yanmar sender unit of the gauge and matching sender combination fitted as standard to both my 4 cylinder engine and to its 6 cylinder brother, also installed in many motor boats in both Europe and the USA.
The Yanmar badged item is available at around £150 -£200 pounds sterling from authorised dealers but none of them list the specs of the sender unit.
Was simply hoping to identify a clone sender with similar specs before having to buy the Yanmar item.
Have replaced the ring terminal (and soldered same ) to remove any chance of high resistance on the connecting wire to the sender.
 
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oldgit said:
One of the engine gauges is displaying low oil pressure at idle.
A search of the internet brings up many examples worldwide of this particular phenomenon :) which is usually solved by simply replacing the old sensor with a branded Yanmar sender unit of the gauge and matching sender combination fitted as standard to both my 4 cylinder engine and to its 6 cylinder brother, also installed in many motor boats in both Europe and the USA.
The Yanmar badged item is available at around £150 -£200 pounds sterling from authorised dealers but none of them list the specs of the sender unit.
Was simply hoping to identify a clone sender with similar specs before having to buy the Yanmar item.
Have replaced the ring terminal (and soldered same ) to remove any chance of high resistance on the connecting wire to the sender.
Click to expand...
I feel your pain, that’s a real rip off price for a sender unit. I will look into what options there are but am struggling at present. Having a pressure on the gauge of kg/cm2 really annoys me as an engineer in instrumentation, not a proper unit and it makes getting a replacement sender even more dificult.
 
oldgit said:
One of the engine gauges is displaying low oil pressure at idle.
Click to expand...
Two thoughts:
1. Swap the engine sensors and see what happens (and/or swap the gauges too).
2. Check that the low oil pressure reading is in fact correct; I bought a professional pressure testing kit, complete with a range of connectors for a few quid on the internet, that showed the sender/gauge was showing the actual pressure correctly. However, that low reading was deemed acceptable by Yanmar for idling. When I had Yanmar 4JH2-UTE engines, I found the following quotation in a Yanmar manual:
Engine speed 3000 rpm ---- 4.0-5.5 kgf/cm^2
Engine speed 800 rpm ---- 0.6 kgf/cm^2 (I suspect this is a minimum).
Another note I have from days of owning those engines:
Yanmar type oil pressure sender PN:119773-91501. This sender has a
pressure range of 0-8 bar with a resistance range of 83-12 ohms
 
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