Question about 2004 Yamaha V Star Classic

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T140 Triumph 750 Bonneville Oil Pressure

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?

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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. 

Posted on Sep 04, 2009

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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.



Posted on Aug 05, 2009

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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.

Posted on Jul 15, 2009

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High temp low oil pressure light comes on after driving for a few minutes, then off when engine at driving rpm. At stop light (idle or low rpm) light comes back on. Normal driving it goes out.

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.

Jul 06, 2015 | 2003 Ford Expedition

1 Answer

Bad oil leak back side primaryy cover underneath can see oil pump out when running in neutral loosing axcessive amoint of oil 1973 Triumph Bonneville T140

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.

Sep 25, 2011 | Triumph Bonneville Motorcycles

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Triumph T140 1976 all light working no oil light when you turn on ignition

Most likely the bulb is burned out.

Next likely, the oil pressure sending unit is bad.

Lastly, wiring - wire unplugged, or grounding out.

Aug 03, 2011 | Triumph Bonneville Motorcycles

1 Answer

Blue thermostat light comes on after driving for 5 miles or so and stays on; after driving for 20 miles or so on occasion the oil pressure light comes on when car slows down and is idling.

when the thermostat in a beetle goes, it stays in the open position, so it could be you blue light is indicating a "cold system",change the thermostat.
the oil light will come on if low on oil or you have a low pressure,try using 10/40 semi synthetic oil.and mloyslip.if no improvement you will need to renew the oil pump.

Jun 18, 2010 | 2002 Volkswagen Beetle Turbo S

1 Answer

Oil light comes on only at idle and only when thr engine is hot. it goes fine at start up and only comes on after about 10 miles and only at idle. the oil level is correct and it is the correct oil

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

Apr 01, 2010 | 2008 Triumph America

1 Answer

Triumph bonneville t120 1968 low oil pressure problems.recently bought my triumph when i noticed the oil warning light did not come on when ignition was switched on.Bought a new one then it worked,but when...

Several things could be at play: Type or weight of oil, confirm this first. Not to question the rebuild but if not done properly (improper bearing clearances, too large) the oil pressure can be low and perhaps a worn pump too. While I am unfamiliar with the engine and oil pump loaction I'd check it if your able too. You'll probably need a good set of feeler gauges to check this if these clearances are outside of the pumps limits the pump will be less able to create pressure; this is of course more evident when the oil heats up.
Another cheap fix is to use a heavier weight oil.
Hope this might help,

Aug 21, 2009 | Triumph Bonneville Motorcycles

1 Answer

Triumph Bonneville T120 oil pressure issue

The oil pressure on a new engine is:

Idle is:  20 - 25 psi
Full pressure is 68 - 80 psi.

Pressure switch operates at 7-11 psi.
The pressure switch could be faulty.

Pressure when hot may be very low
and  if it is returning oil to the tank
that is a good sign it is still pumping.

Aug 19, 2009 | 2004 Yamaha V Star Classic

1 Answer

My 1999 pontiac grand am will idle low, but does not cut off.

Sounds like your oil pressure sensor may be faulty. Or your oil level is very low. Your engine should idle as low as 650 rpm without your light coming on.

Apr 10, 2009 | 1999 Pontiac Grand Am GT

2 Answers

Oil Pressure drops but returns when i restart

your engine needs flushed .what is going on is idle has less pressure than driving and the sump is picking up dirt and debris but when you turn off or idle the debris falls off the sump.

Mar 12, 2009 | 2001 Chrysler Voyager

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