Perkins diesel engine blowby
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    Perkins diesel engine blowby

    So obviously it's not a tractor engine but it is an irrigation pump so it sorta fits this section. I have a perkins t6.3544 engine running a water pump, it runs fine overall but I have an oil loss problem that I just found whare I'm losing the oil. The oil is coming out the dipstick! Not like gushing out or anything but it has no seal and I think it's the submerged dipstick tube setup so any little bit if crank case pressure on this older engine caused the oil to slowly run down the side of the dip stick. The crank vent tube is working fine and it have maybe a tiny but extra blown but nothing crazy. I can take the oil fill cap off when it's running and not get anything more than a slight haze no real pressure but the dipstick loses oil. It seems to be when it goes past 2100 rpm that It gets the pressure to push it out the stick. We had the valve guides repaired over the winter because it was actually burning oil but now it just loses oil out the dipstick. I have been confused for weeks whare my oil was going and I just noticed it running down the dipstick a little and thus why It is ending up in the spot I do see it. So question is what can I do to fix this? Can I seal the dipstick so it still pulls out but will keep oil from pushing out? Some way or another? Or just deal with it.... thanks!

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    ttazzman's Avatar
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    sounds like a plugged vent or pvc valve

    my last perkins engine in a caterpillar had a vent off the "valve cover" to relieve pressure
    John Deere
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    Yea the crank vent tube comes out the top about 6 inches from the oil fill cap. Ok so how do I unplug it? It appears to still be venting I should mention.
    Attached Thumbnails Attached Thumbnails 20190719_225827_1563589825633.jpg  

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    https://youtu.be/TIQ37ZqQD1o

    That video just shows the vent tube, looks like a normal amount of venting, although it wouldn't take much of a pressure backup to push it out the tube.
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    Side note, what is the design safe rpm to run these at for extended periods? Like when I'm running irrigation guns it could run at 2300-2400 for extended periods. Is this too high for this engine?

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    ttazzman's Avatar
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    most like 2100-2200 so i would think you would be in the "safe" range.........personally i rarely run any of my diesel stuff above 2000 ...and usually more like 1800 ...but thats just me ( you can probably look up your specific engine model and see what the design rpm range is)


    also since the vent appears to be working correctly i am not sure why your having problems with the dipstick.......i would be tempted to put a tight O-ring around the dipstick at the top to seal it and see if that worked...most dipsticks positively engage the tube to keep them sealed to keep them from blowing oil out...and drawing in dust and dirt
    Last edited by ttazzman; 07-19-2019 at 11:16 PM.
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    John Deere
    5105M
    2140
    4500
    Caterpillar
    D4Hxl
    416C
    Gehl
    5635DX

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    Oring wouldent melt? Or fall in... also when u look up the engine specs it just says 2600 for rpm so maybe that's max?

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    I checked the vent, I thought there would be a pcv valve but I guess it's just a direct vent? Or maybe it was modified? Also the engine is not on a level pad apparently so it could be that theres too much oil. I added an oring to the dipstick to hopefully fix the issue.
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    ttazzman's Avatar
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    o-ring should be fine heat wise.........wouldnt want it to fall in either but that wouldnt be the end of the world use your own judgement on fit and risk...


    if the spec says 2600 that is usually the RPM the hp is rated at, so it should be ok .....usually generators and pumps run at 1800-2200 so you might look up your pump spec for rpms and match it up, also many times the specs will include a fuel ussage chart that is good to consider on a constant speed application like a pump....its all a balence in my opinion
    Last edited by ttazzman; 07-21-2019 at 01:29 PM.
    John Deere
    5105M
    2140
    4500
    Caterpillar
    D4Hxl
    416C
    Gehl
    5635DX

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    The pump is peak efficiency at 2400 rpm. I only run it higher than 21 when I need high pressure. I found orings that fit nice so that may fix it atleast. I also noticed the engine is not level in the pump spot so max on the dipstick will be a bit more than full.

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