low compression

artificer · Posted: Sun Mar 13, 2011 4:31 pm Post subject:

Sounds like the valve adjustments are all out.
Here's what you can do & it is very simple with the rocker & side cover off:
1. get No 1 @ TDC compression on your timing gear cover marker & adjust both Number 1 valves to correct clearance (Wes told you).
2. put a chalk mark on the front belt pulley 180 degrees from your timing mark (directly opposite the real timing mark).
3. carefully rotate the engine JUST 180 degrees in correct DOR so that the chalk mark is now @ the timing mark on the gear cover
& adjust valves to correct clearance on Number 3
4. rotate engine 180 degrees so your timing marks line up & adjust vales to correct clearances on Number 4
5. rotate engine 180 degrees so the chalk mark now lines up & adjust Number 2 to correct clearances.
You are all DONE....how simple can it get?
The basis of this is you have a 4 cylinder 4 cycle engine in which all cylinders have fired in 720 degrees or 2 full crank rotations. This means each cylinder fires in turn every 180 degrees in the correct firing order (4 X 180= 720).
When one cylinder is firing both is valves are fully closed & should be gapped there.
Its opposite number is in the same position TDC but its valves positions are in what is called on the rock (neither opened or closed)
_________________
John GIBBINS
ASE Master Medium/Heavy Truck & Auto Technician 2002 USA
Licensed Motor Mechanic NSW # MVIC 49593 Current
YOU CAN'T TROUBLESHOOT WHAT YOU DON'T UNDERSTAND

joeyfast13 · Posted: Sun Mar 13, 2011 10:37 pm Post subject:

i adjusted the intake valves just cant get the feeler gauge in between the exhaust valves

artificer · Posted: Mon Mar 14, 2011 12:41 am Post subject:

Well if you can't get the feeler in between the valve & follower & the cylinder you are working on is @ TDC COMPRESSION you need to loosen off the exhaust adjusters until the feeler does go thru.
Other than that you are not doing things exactly as I suggested & your inlet adjustments will not be correct either.
Get 1 @ TDC compression then adjust both valves which will be both fully closed & should have gap. Then do 3 then do 4 then 2 as I suggested 180 degrees apart.
_________________
John GIBBINS
ASE Master Medium/Heavy Truck & Auto Technician 2002 USA
Licensed Motor Mechanic NSW # MVIC 49593 Current
YOU CAN'T TROUBLESHOOT WHAT YOU DON'T UNDERSTAND

joeyfast13 · Posted: Tue Mar 15, 2011 4:57 pm Post subject:

well i mean there is a gap between the valve and the lifter on the exaust its just my feeler gauges wont go in between the two because its like its curved

RICKG · Member Joined: Aug 31, 2010 Posts: 1741 Location: SO IDAHO

HUH?? CURVED?? MAN YOU NEED TO POST SOME PHOTOS..
_________________
keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a

wesk · Posted: Tue Mar 15, 2011 9:01 pm Post subject:

go to your auto parts store and buy the correct tapered and angled tip tappet adjusting feeler gage set.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

RimfireJim · Posted: Tue Mar 15, 2011 11:08 pm Post subject:


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