low compression

artificer · Post by **artificer** » Sun Mar 13, 2011 4:31 pm

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)

joeyfast13 · Post by **joeyfast13** » Sun Mar 13, 2011 10:37 pm

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

artificer · Post by **artificer** » Mon Mar 14, 2011 12:41 am

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.

joeyfast13 · Post by **joeyfast13** » Tue Mar 15, 2011 4:57 pm

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 · Post by **RICKG** » Tue Mar 15, 2011 6:59 pm

HUH?? CURVED?? MAN YOU NEED TO POST SOME PHOTOS..

Post by **wesk** » Tue Mar 15, 2011 9:01 pm

go to your auto parts store and buy the correct tapered and angled tip tappet adjusting feeler gage set.

RimfireJim · Post by **RimfireJim** » Tue Mar 15, 2011 11:08 pm

wesk wrote:go to your auto parts store and buy the correct tapered and angled tip tappet adjusting feeler gage set.

I think Wes means something like this http://www.tooltopia.com/lisle-68050.aspx, but with tapered tips, which I don't find with a quick search. I see tapered gauges, and angled gauges, but not both in one.
-Jim