no oil pressure - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 07-07-2018, 05:37 PM Thread Starter
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no oil pressure

Some time last month I had a bad oil sender, I put a new one in and that solved the problem, now my oil light came on and I put a mechanical gauge in place of the sender and there`s zero oil pressure, maybe the oil pump drive chain is broke, my question is, can I remove the left side case cover and access the pump and chain without dis-assembling the complete engine? Any info will be appreciated. RCM
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post #2 of 8 (permalink) Old 07-08-2018, 11:54 AM
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First step in the manual for oil pump removal - "split the case". (right side)

If it happens to be a problem with the oil pressure relief valve, that's behind the stator cover (left side), just under and behind the rotor, above the oil pipe.

With the right side cover removed, I think you can check the oil pump chain through the holes.

Best to download the free repair manual. Link is around here somewhere, I'm saving it again next time I find it.

Complete engine rebuild in these videos - https://www.youtube.com/channel/UCXG...ITj3R4_iL3SGXg

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__________________________________________________ ____________
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post #3 of 8 (permalink) Old 07-08-2018, 01:14 PM Thread Starter
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I`ve got a Chilton`s manual on the 750, I was hoping there was a short cut without removing the engine and splitting the cases, this engine has 32K miles and never had a problem, now it looks like major problem.
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post #4 of 8 (permalink) Old 07-08-2018, 01:31 PM
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Do you hear any noises from the top or bottom ends? Seems like the first area to suffer would be the hydraulic lash adjusters in the valvetrain.

Any chance the block fitting is clogged? Did you connect the mech. gauge to the block fitting or the engine block itself?

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__________________________________________________ ____________
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post #5 of 8 (permalink) Old 07-08-2018, 02:09 PM Thread Starter
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Yes, I put a mechanical gauge in place of the sending switch, 0 oil pressure, and I did notice the upper end was chattering lighgtly.
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post #6 of 8 (permalink) Old 07-08-2018, 02:32 PM
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Ok, the chattering confirms what the gauge is reading.

There's an adapter fitting that threads between the sender sw. and the block, but I don't think it's the problem now.

Someone else mentioned their oil pump chain broke also, some time in the past 6 months.

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__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 07-08-2018 at 02:35 PM.
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post #7 of 8 (permalink) Old 07-19-2018, 07:27 PM
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no oil pressure

I would like to know the same thing my 750 has around 40 pounds at 4000 rpm by the book. when first started it has a light knock or rattle it has plenty of pressure then but as the motor warms up the knock rattle goes away but the oil pressure drops to around 10 pounds or so. the light came on sometimes also have put mech gauge on board straight to motor it is strange that it warms up and goes away then pressure drops.
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post #8 of 8 (permalink) Old 07-19-2018, 08:00 PM
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slight knock or rattle may be the cam chains, there are 4 of them afterall. if the ACCT's are starting to fail, you will get a rattle that could go away as it warms up.

its normal for oil pressure to drop as the engine warms, metal expands, oil clearances on the main and rod bearings increases due to expansion of metal, and to an extant, the oil itself will thin some with temp increase

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