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J reg Diahatsu Fourtrak 2.8td with no Compression

 
 
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Russ Ellis
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Joined: 02 Feb 2015
Odometer: 3
Location: wiltshire



PostPosted: Tue Feb 03, 2015 12:08 pm    Post subject: J reg Diahatsu Fourtrak 2.8td with no Compression Reply with quote

There is no compression on any of the cylinders when cranking on the key. I have attached the compression testing kit via both injector adapter and via the glow plug adapter no reading from either point. Is there a common cause for a lack of compression on these engine types. Is there a better place to check compression to get a true reading. I have check cam belt for any problems and that it is timed up correctly which i believe that it wasnt so i reset the timing to where i believe it to be correct. I then rebuilt things back enough to crank it over but made no change there was still no compression via compression tester. But i did crank it over with the injectors out individually and there appeared to have enough compression to spray fuel out high enough to spray against the underside of the bonnet. I'm now a bit stuck now. Am i testing the compression in the right place. Where would you suggest for me to check next. Is there an easy way that i can check the position of the piston as can't check it via the injector hole as it does not go direct onto the top of the piston. I got the vehicle in a non starting state so do know the complete history of the fault or whether the engine cut out or it has be rebuilt incorrectly as it does appear to have had a cambelt kit fitted fairly recently. Any help that i could get on this problem would be gratefully appreciated.
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bushman1978
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Xpajun
Mud Obsessed


Joined: 22 Sep 2008
Odometer: 3242



1988 Mitsubishi Shogun

PostPosted: Tue Feb 03, 2015 12:25 pm    Post subject: Reply with quote

when all the injectors and glow plugs are in situ, what is it like to turn over by hand i.e. socket and bar on the crank pulley bolt
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Russ Ellis
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Joined: 02 Feb 2015
Odometer: 3
Location: wiltshire



PostPosted: Tue Feb 03, 2015 1:17 pm    Post subject: Reply with quote

its ok to turn over by hand it build up compression and releases normally it didnt originally it would have hardly no resistance so rotated timing around 180 degrees which has made a significant improvement. i wonder now if its the injector pump is 180 degrees out now but its hard to tell as its clearly had new timing belt kit replaced very recently as all very clean and writing is still clearly visible on the belt so its possible its been put back together wrong. Is there an easy way to find out the pistion of piston as tried putting long screwdriver down injector and glow plug whole but it didnt go up or down when i rotated crankshaft. if i could find the piston position i could then check whether the crankshaft is correctly aligned in relation to the camshaft aligment, then this would just leave just the diesel pump alignment in question. any suggestions how i could find the piston position without removing cylinder head.
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bushman1978
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Biosgues
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Joined: 27 May 2015
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PostPosted: Wed May 27, 2015 11:10 am    Post subject: Reply with quote

Congratulations lot. I was cheering on track.
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mike328
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Joined: 10 Dec 2014
Odometer: 793
Location: Suffolk!



PostPosted: Wed May 27, 2015 11:20 pm    Post subject: Reply with quote

if you bought it as non runner id pull the rocker cover off and put and have a quick look - pull the rocker shaft and check the push rods are all straight. also check that with it still out all the valve tops are at the same height with a straight edge.. and maybe compression check again without refitting it... a bit of oil poured down the bores at that stage would rule out piston rings.
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Snap On: Turning drawers into status symbols since 1920.
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MYTHING
Just got MTs


Joined: 26 Feb 2009
Odometer: 130
Location: Swindon



PostPosted: Mon Jun 01, 2015 7:28 pm    Post subject: Position of piston Reply with quote

As you don't know where anything is timed to so therefore can't use where the rockers are I would suggest partly filling number one with diesel then manually turn the engine over and you should be able to tell by the air/diesel mix coming out of the injector hole where TDC is, it only needs to be near as you should be able to find marks or a pilot hole at TDC

A lot use pilot holes usually about a 5mm drill will fit in it, it may be worth checking first anyway

Good luck

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classic Range Rover 3.5 with lift and lots of mods and needs to be used more. Called THING as my Daughter said "youre not taking me to school in that thing DAD"
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