I have a 76 750 T140 Triumph Bonneville, At low idle the oil light comes on Driving down the road it goes off? My Oil Sending switch is 33 years old kinda rusted could it be that. I was thinking I could unscrew the oil sending unit and screw in a oil pressure Gauge? What should the oil pressure Be?
Before listening to the doom merchants try this first. Make sure the oil seal in the timing case (not points cover - the crankshaft one) is the right way round (spring side showing) and seated OK. When fitting case oil up the seal well and turn engine over (plugs out) while tapping the case home gently with your fist - if this seal is not dead right it will alow enough oil passed it to throw the pressure switch open without causing any damage. Had my T140 32 years.
Pressure should be 60 lb/in . I have a '78 T140D and at the moment have an oil pressure gauge screwed directly into the engine case. I am looking for an adaptor so that I can run a hose up to the handlebars and mount the gauge there so if you find one anywhere perhaps you could let me know.
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Re: T140 Triumph 750 Bonneville Oil Pressure
You will most likely find a low oil pressure problem. It is possible it is the switch, but with a bike that old, I would guess more oil pump clearance issues, or other worn parts in engine. You can try running some 20w50 oil to take up some clearance, but it is only a patch. Oil pressure should be no less than 7-10 psi.
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CarGurusApr 2, 2012 - As I continue to drive, the RPM needed to keep the oil light off (and therefore ... and when the light does turn on, I'm either at the other end of town from ... let it idle for 15min with the dummy light flashing? does the engine start ...
You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.
The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.
If it is indeed coming from the primary case, most likely it could be the primary cover gasket, or the oil seal for the transmission shaft that extends into the primary (the black seal around the rear shaft in the pic), that the clutch hub mounts to, or the gasket for the round plate (with the 6 screws) that the above mentioned seal presses into.
Hi Anonymous, if your oil pressure gauge is acting eratic or your oil pressure light stays on you could have a faulty sending unit, gauge or air in the system or a restricted oil filter, start by checking oil level in tank and make sure it is between the add and full mark. With engine at normal operating temperature 180-230 degrees and the use of a 10 micron synthetic media oil filter, oil pressure will be 30-38 psi at 2,000 RPM and 3-5 psi. at idle. The oil pressure light is designed to come on at 2 psi. or less. To accurately test oil pressure remove oil pressure sending unit and install known good oil pressure gauge that reads 0-50, there might possibly be some plumbing required for hard to access points. If you are out in the middle of nowhere and there is no cell phone service and your oil pressure gauge isn't working and your oil pressure light is burned out, despair not, you still have one last line of defense left HYDRAULIC LIFTERS, as long as those tireless workers are quiet, you have oil pressure, maybe not much, but enough to get you down the road at a slow to moderate speed using the least amount of RPMS as necessary. Good luck and have nice day.
It may be worth trying a new oil pressure sender switch, if it still comes on, fit a pressure gauge to the oil system(can use the switch hole)
although the oil is correct grade, perhaps try one grade thicker, if it really has low pressure its not a good ting
Check the oil level to see if its low. If the oil is fine, this can be very serious. in this case, you will need to check the oil pressure sending unit. make sure it is not malfunctioning. replace if so.
Now, if the sending unit checks out ok, this will be a faulty oil pump or, a clogged oil screen. replace both if found to be damaged in any way.
when you press the brake pedal the brake master cylinder vacuum booster takes vacuum away from the engine and that slows the idle speed just enough to trigger the low pressure oil light. Pull the oil pressure sending unit out and hook up an oil pressure test gage, if the pressure is above 15 PSI hot engine idle in drive replace the oil pressure sending unit.