oil pressure problem


Information and questions on GL1100 Goldwings (1980-1983)
  • Sponsored Links
T-Rat
Posts: 62
Joined: Sun Jan 25, 2015 8:37 am
Location: knoxville tn
Motorcycle: 1983 GL1100a & 2000 Sportster 1200

oil pressure problem

Postby T-Rat » Mon Oct 12, 2015 2:33 pm



I have been slowly resurrecting a GL1100 1983 model Interstate since March. It sat for 10 years or so before I got it. I have built carbs replaced timing belts replaced fuel tank and all the other little things that go wrong when you let a bike sit. Today I finished up the brakes and was planing to take the first ride. I have been starting the bike and letting it idle for a while at least once a week. Yesterday when I started it and after it warmed up the oil pressure light was flickering on and off at idle but went out as soon as I increased the speed. It had never done that before. Today after it was warm the oil light came on and won't go off until it's above 3000rpm.It's full of oil Mobile 1 v twin 20w50. No noise just the light. any thoughts. I was afraid to ride it. shut it off and came in and thought about it.....sender? Oil Pressure? Oil Screen? what are your thoughts?



User avatar
TR6
Posts: 11
Joined: Sun Sep 27, 2015 2:10 am
Location: Germany Saarbrücken
Motorcycle: 1980 Gl1100
1982 VF750 C

Re: oil pressure problem

Postby TR6 » Mon Oct 12, 2015 2:51 pm

Hi T-Rat.

The first step is to fit an oil gauge to verify the oil pressure (You have enough oil in the machine?)! Let run the motor only a few seconds (5)!
Replace the oil sensor with an a gauge and compare it with the values in the repair manual (to download on this forum?).

Regards Stefan
Loud pipes save lifes.

T-Rat
Posts: 62
Joined: Sun Jan 25, 2015 8:37 am
Location: knoxville tn
Motorcycle: 1983 GL1100a & 2000 Sportster 1200

Re: oil pressure problem

Postby T-Rat » Mon Oct 12, 2015 3:00 pm

yeah was going to borrow a remote gauge tomorrow at work. Yes it's full of oil

T-Rat
Posts: 62
Joined: Sun Jan 25, 2015 8:37 am
Location: knoxville tn
Motorcycle: 1983 GL1100a & 2000 Sportster 1200

Re: oil pressure problem

Postby T-Rat » Mon Oct 12, 2015 4:44 pm

here's a little update......just went out and started the wing it has sat a couple of hours so it was cold. When started light went out immediately. I set the idle at 1500 and let it warm up. just as the temp gauge was getting out of the blue range the light started flickering then came on all the time. I slowly increased the idle and at about 22 to 2500 it would go out then come back on as I slowed it back down. I went ahead and shut it off at that point. Didn't want to do any more damage. There is no noise and no smoke and motor is running good at idle and up to where the light came on. I didn't go any further at that point.

User avatar
Aussie81Interstate
Posts: 682
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: oil pressure problem

Postby Aussie81Interstate » Mon Oct 12, 2015 4:52 pm

What grade oil are you running? I'm thinking it might be too thin when the motor is warming up and affecting the oil pressure sender unit?

Other than that - I would put maybe an extra amount of oil in (maybe a litre or a pint) and see if that has any effect - how do you know you have the correct amount of oil - can you see the level in the window ?? :)

T-Rat
Posts: 62
Joined: Sun Jan 25, 2015 8:37 am
Location: knoxville tn
Motorcycle: 1983 GL1100a & 2000 Sportster 1200

Re: oil pressure problem

Postby T-Rat » Mon Oct 12, 2015 5:11 pm

Running Mobil1 VTwin 20W50......Yeah the oil in the window is right where it should be and there is also a dip stick at the front and it shows full. Oil has been in there all summer but I haven't had the bike to the point of riding yet. I have started it and let it run at least once a week since I changed the oil in March. Yesterday and today is the first time I have had the light problem and it is cooler here today (high of 68) than it has been all year.

User avatar
Aussie81Interstate
Posts: 682
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: oil pressure problem

Postby Aussie81Interstate » Mon Oct 12, 2015 7:30 pm

I would be checking the oil sender unit, but checking for good ground and if the wiring is getting pinched somewhere -maybe it is a wiring issue ? intermittent connection ??

Also does your bike have an oil pressure gauge on the dashboard ? or is it only the oil pressure light in the ignition panel?

User avatar
wingman12
Posts: 610
Joined: Fri Aug 22, 2014 5:01 pm
Location: Land of Lincoln
Motorcycle: 1999 gl1500 se

Re: oil pressure problem

Postby wingman12 » Mon Oct 12, 2015 10:06 pm

Good evening T-Rat, since this oil light is new, I would suspect the oil filter. Add 1/2 bottle of seafoam to oil, run at 2500 rpm until oil pressure light comes on steady, change oil and filter. Use mfg suggested 10W40 oil. With sitting for 10 years there is probably a lot of crusty oil crap in the block. If oil is extremely black and looks gummy, I would repeat the seafoam cleaning step until the oil looks honey colored after running for 50/60 miles. :D :D

User avatar
TR6
Posts: 11
Joined: Sun Sep 27, 2015 2:10 am
Location: Germany Saarbrücken
Motorcycle: 1980 Gl1100
1982 VF750 C

Re: oil pressure problem

Postby TR6 » Tue Oct 13, 2015 12:46 am

How much miles has your Wing?
Fit an external gauge verify the values.
Use cleaner as wingman said.

If the problem is not gone, there can be many reasons to have bat oil pressure.
Driving 20W50, you have more oil pressure as with 10W40.

Regards

Stefan
Loud pipes save lifes.

T-Rat
Posts: 62
Joined: Sun Jan 25, 2015 8:37 am
Location: knoxville tn
Motorcycle: 1983 GL1100a & 2000 Sportster 1200

Re: oil pressure problem

Postby T-Rat » Tue Oct 13, 2015 4:01 am

Oil is very clean looking but I'm gonna change it anyway. No pressure gauge on dash only light. I am going to borrow a remote gauge today from one of the mechanics at work and see what that shows The bike only has 41,000 miles on it. Thanks to all for suggestions. I am hoping that it is just the sender.

f1xrupr
Posts: 396
Joined: Mon Jan 13, 2014 6:13 am
Location: Triplet Va
Motorcycle: 1980 gl 1100 Std. Vetter

Re: oil pressure problem

Postby f1xrupr » Tue Oct 13, 2015 7:57 am

This is not a highjack, but an illustration-years ago, my son had a Dodge Dakota that ran great! But, when it got hot, it done EXACTLY what your bike is doing. Here's what was happening....as the engine and oil increased in temperature, the oil system needed more VOLUME due to the oil being thinner (Multi-weight oil don't work exactly like most people think-it's a relativity thing-it's thinner when hot)
Due to the increased oil volume demand, the sump would pick up sludge that was otherwise laying in the bottom of the oil pan! It was amazing how consistent it happened (we didn't have tags on it yet-just bought it "cheap", but no one told us of the problem).
We suspected (after lots of pondering) this might be the problem, took off the oil pan, and sure enough, about a cup full of goop-that may not sound like much, but it was enough to stop up the pick-up screen.
Put it back together, ran great till my son hit a tree-not head-on" he was ok...
It also could be "blue silicon" (that some people think they need to use a half of a tube of) getting sucked up. ..
The 1100 has a clean-out port-I guess you knew that....

Edit...oh-the new oil you put in may be a higher detergent than the old oil, and broke loose sludge...
My exercise bike is a goldwing.

User avatar
WingAdmin
Site Admin
Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: oil pressure problem

Postby WingAdmin » Tue Oct 13, 2015 9:22 am

If the oil weight is correct, I would suspect the oil pressure sender. Very rarely have I heard of an actual oil pump failure in these bikes - it's almost always a failure of the oil pressure sender. You need to remove the sender and screw a pressure gauge in its place to measure the actual oil pressure, to determine if it's an actual oil pressure issue or just a faulty sender.

The oil light should be coming on when oil pressure drops below 3 psi, and going out when pressure rises to between 3-6 psi.

Correct oil pressure is:

Cold: 60 psi at 900 rpm, 64 psi at 5000 rpm
Hot: 12 psi at 900 rpm, 60 psi at 5000 rpm

You can also test the oil pressure by removing the rear oil galley plug and screwing in your pressure gauge there, without having to remove the pressure sender:

Oil pressure test
Oil pressure test

T-Rat
Posts: 62
Joined: Sun Jan 25, 2015 8:37 am
Location: knoxville tn
Motorcycle: 1983 GL1100a & 2000 Sportster 1200

Re: oil pressure problem

Postby T-Rat » Tue Oct 13, 2015 4:34 pm

Thanks again to all.....I was going to borrow a test gauge from one of the mechanics at work but no one had the correct adapter to mate to the block on a goldwing, best we can tell it is a 1/8" 27 thread. Looking on line I found a tester at harbor fright that includes this size in the kit. It is only 26.99 so I think I will try to get by and pick one up. Has any body had any experience with this kit? Looking at the reviews on line it seems like it is a pretty good kit!

User avatar
bill55
Posts: 17
Joined: Fri May 09, 2014 4:20 pm
Location: slatington, pa
Motorcycle: 1982 aspencade

Re: oil pressure problem

Postby bill55 » Sun Nov 01, 2015 11:37 am

Can anyone point out the clean out port or oil galley plug in a picture? Also what would be the clean out procedure?




Return to “GL1100 Information & Questions”




Who is online

Users browsing this forum: PhotoDoctor and 4 guests