powered by:
September 01, 2024, 12:26:24 AM
Welcome,
Guest
. Please
login
or
register
.
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
News
:
Tapatalk users...click me
Home
Help
Search
Login
Register
Discussion Boards
Introduce Yourself
FAQs and Policies
General Monster Forum
Remembering our friends...in Memorium
Riding Techniques
Tutorials
Tech
Accessories & Mods
Gear
Racing & Trackdays
Stolen Motorcycles
No Moto Content
Board Tech Issues
Local Club Boards
BOMb
RCP
Sponsors
Valley Desmo Service
California Cycleworks
MotorcycleGear.Com
Monsterparts
Minor Sponsor Board
Sponsor Info
Flea Market
Monsters for Sale
Monsters Wanted
Other Bikes
Parts for Sale
Parts Wanted
Gear for Sale
Misc for Sale/Wanted
Ducati Monster Forum
>
Moto Board
>
Tech
(Moderator:
Speeddog
) >
OIl pressure light mystery
Pages: [
1
]
Go Down
« previous
next »
Print
Author
Topic: OIl pressure light mystery (Read 569 times)
Mark_W
New Member
Offline
Posts: 8
OIl pressure light mystery
«
on:
July 05, 2024, 09:04:23 AM »
I've recently picked up a 2006 Monster 620. Thanks to the information I found on this site I was able to diagnose the fault in the fuel pump wiring and was able to clean the inside of the flange plug, re-solder the connections, and get the bike running. All was well until last weekend's washing. After the wash the oil pressure light stays on. Here's what I have done since then:
1. Unplugged the wire at the sensor to check for water leakage: no. Blew it out with compressed air anyway: still no. Cleaned the connectins with WD40, dried them, tried again: still, the light stays on when the engine is running.
2. Tested the wiring from the switch connection to the insruments by grounding the wire for the oil pressure switch. Grounded, the light is on. Ungrounded, the light is off. So the light works as it should.
3. Check the switch. Attached a test lamp between the switch and battery. The test lamp is on with the engine off. The light goes out when the engine runs. Lamp lights again when the engine stops. So, the switch checks out.
4. Plug the wire to panel back in. Engine off: light on. Engine running: light on. Engine stopped: light on.
5. Back to the test lamp. Engine off: lamp on. Engine running: lamp off. Engine stopped: lamp on.
6. Grabbed the multimeter and set it to test continuity. Attached to switch and a cylinder fin. Engine off: continuity tone sounds. Engine running: continuity tone is silent. Stop engine: continuity tone sounds again.
7. Switched to ohm meter mode: Engine stopped: resistance of a few ohms. Engine running: Open Line. Engine stopped: a few ohms again.
8. Switched to k-ohms. Engine stopped: reading near zero. Engine running: about 2k ohms (?). Engine stopped: near zero resistance.
9. Went back to auto-ranging: Engine stopped: a few ohms. Engine running: Open Line. Engine stopped: a few ohms.
10. Plugged the panel lamp back in: Stays on when the engine is running.
11. Attached the test lamp: Shuts off when the engine is running.
I'm stumped. I don't have a spare switch laying around that will fit.
Logged
Ddan
Some of my best friends are whores
Hero Member
Offline
Posts: 9082
Re: OIl pressure light mystery
«
Reply #1 on:
July 05, 2024, 09:50:26 AM »
The connection got wet when you washed it, once it dries out it should go back to normal function
Logged
2000 Monster 900Sie, a few changes
1992 900 SS,
currently a pile of parts.
Now running
flogged successfully
NHMS 12 customized. Twice. T3 too.
Ducati Monster Forum at
www.ducatimonsterforum.org
stopintime
Hero Member
Offline
Posts: 8984
S2R 800 '07
Re: OIl pressure light mystery
«
Reply #2 on:
July 05, 2024, 10:16:29 AM »
You get to know your bike. That's good.
Very common fault on our bikes.
Logged
237,000 km/sixteen years - loving it
Mark_W
New Member
Offline
Posts: 8
Re: OIl pressure light mystery
«
Reply #3 on:
July 05, 2024, 12:34:04 PM »
Quote from: Ddan on July 05, 2024, 09:50:26 AM
The connection got wet when you washed it, once it dries out it should go back to normal function
It sat unplugged since last Saturday. I'm in Arizona. It HAS to be dry by now. Is there someplace for water to become really trapped and resist drying even in 100F plus temperatures? I have thought about just running it (since the test lamp indicates all's OK) and allowing engine heat to really soak the switch.
Logged
stopintime
Hero Member
Offline
Posts: 8984
S2R 800 '07
Re: OIl pressure light mystery
«
Reply #4 on:
July 05, 2024, 04:32:42 PM »
One of your tests confirms pressure, doesn't it?
«
Last Edit: July 05, 2024, 04:34:38 PM by stopintime
»
Logged
237,000 km/sixteen years - loving it
Howie
Post Whore
Offline
Posts: 17116
Re: OIl pressure light mystery
«
Reply #5 on:
July 06, 2024, 07:30:22 AM »
Those connectors are really good at letting water in and keeping it there. You proved the sending unit is functioning as well as the light. The problem is in the connection. Could be still damp, corroded or loose. When you finally get it working, pack the connector with dielectric grease. Also make sure the connector from the stator ( three large yellow wires) is in good shape and pack with dielectric grease.
Logged
Mark_W
New Member
Offline
Posts: 8
Re: OIl pressure light mystery
«
Reply #6 on:
July 07, 2024, 05:53:59 PM »
A friend had an oil pressure gauge with the correct fitting adapter so I ran a mechanical test. Plenty of oil pressure. Maybe too high (50 psi at idle) but I have not yet changed the filter or cleaned the screen. Rode for about an hour today and the light is still on so the switch is clearly faulty. It's over 110 here in the afternoon so if there was any moisture in the switch it must have had opportuinty to dry out after running at those temperatures. At least the switch will be quite easy to replace.
Thanks for the advice.
Logged
Howie
Post Whore
Offline
Posts: 17116
Re: OIl pressure light mystery
«
Reply #7 on:
July 07, 2024, 08:08:20 PM »
Cold engine:
1100-1300 rpm: at least 2.5 bar, 3500-4000 rpm: between 4 and 6 bar.
Hot engine (140°C):
1100-1300 rpm: at least 1. 1 bar, 3500-4000 rpm: between 4 and 6 Bar.
It's a long way to the top of the vertical cylinder.
Logged
Mark_W
New Member
Offline
Posts: 8
Re: OIl pressure light mystery
«
Reply #8 on:
July 08, 2024, 01:15:38 PM »
Thanks for the numbers. In a cold (90F engine) the pressures were about 3.5 bar at idle and 6 bar at 3500 or so.
Today's ride to work confirmed that the pressure switch was in its last throes of life. It worked at the start at home. Was completely dead when I left work. Even after sitting for a few hours the switch is still open. I imagine that the diaphragm fractured.
Logged
Pages: [
1
]
Go Up
Print
« previous
next »
Jump to:
Please select a destination:
-----------------------------
Introductions
-----------------------------
=> Introduce Yourself
=> FAQs and Board Policies
-----------------------------
Moto Board
-----------------------------
=> General Monster Forum
=> In Memorium...Remembering our Friends
=> Riding Techniques
=> Tutorials
=> Tech
=> Accessories & Mods
=> Gear
=> Racing & Trackdays
=> Stolen Motorcycles
=> Random Cool Pics
-----------------------------
Kitchen Sink
-----------------------------
=> No Moto Content
===> Board Suggestions
===> Fixed Board Issues
=> Stella's Pop
-----------------------------
DMF Sponsors
-----------------------------
=> Valley Desmo Service
=> Ca-Cycleworks
=> New Enough.Com
=> Monsterparts
=> Minor Sponsors
=> Misc Info
-----------------------------
Local Clubs
-----------------------------
=> Monster Women
=> Ducati MOB
=> SoCal Monsters
=> CAM
=> OZ monsters
=> NorthWest
=> NEMHA
=> NYMMC
=> MHM
=> SoCO DOG
=> DFWM
=> MADDOG
=> MOCHA
=> THCM
=> AZDRA
=> M-ROC
=> Central Cal Monsters
=> DOCSF
=> MCMC
=> DDCM
=> DOCTOR
=> Hoosier Hooligans
=> OMHA
=> DOCIA
=> Rising Sun Ducatis
=> MCM
=> NMMR
=> MIA
=> Desmotropic
=> COW
=> MOTH
=> DesmOK
=> Bayou Country Ducati Riders
=> DeVal Mostro
=> Coastal Ducati Club
-----------------------------
Configurators and Calculators
-----------------------------
=> Valve Shim Calculator
Loading...
SimplePortal 2.1.1