_glennhailstone_
Posted 30 August 2014 - 01:39 PM
Im just setting up my dissy for the first time and I am trying to find the compression stroke.
I put a balloon on a hose which is screwed into the No1 cylinder. But it seems that every time the piston comes up towards TDC the balloon inflates.
I thought that on every second stroke the balloon should not inflate, because the exhaust valve should be open.
Does this mean I have set something up wrong, I know I set the cam gear and crank gear up so the dots aligned.
Out to the experts….
CABIN ENGINE CONTROLS GALORE
Posted 30 August 2014 - 01:59 PM
Hello Glenn,
A compression stroke,
is when the #1 rockers are floating ( not pushing a valve ).
_Bomber Watson_
Posted 30 August 2014 - 02:00 PM
CABIN ENGINE CONTROLS GALORE
Posted 30 August 2014 - 02:01 PM
If that has not occurred,
there is something wrong
Forum Fixture
Posted 30 August 2014 - 02:03 PM
just stick your finger in the dizzy hole before you put the dizzy in . you should feel the cam gear on the cam . The first cam lobe towards the rear of the motor should be pointing down and the first cam lobe towards the front of the motor should be pointing up . If it is opposite , then it is 180 out
_glennhailstone_
Posted 30 August 2014 - 02:16 PM
Ok thanks, but what about the balloon.. If its inflating on both strokes doesnt that mean the exhaust valve isn't opening. I just installed new roller rockers.
_Bomber Watson_
Posted 30 August 2014 - 02:27 PM
CABIN ENGINE CONTROLS GALORE
Posted 30 August 2014 - 02:31 PM
I have not done a Balloon job before Glenn,
but I would suspect there is something still wrong.
Another check is,
when looking at the front of the crank cam gear ( driver ) key-way,
this key should be facing up vertically,
when the Cam gear Dots are lined up dot to dot,
at the same time.
I should go out to my car with a balloon
_glennhailstone_
Posted 30 August 2014 - 02:51 PM
Thanks, yea if you could check would be good. I don't really want to take the timing gear cover off again.
But I do suspect an issue here : (
Forum Fixture
Posted 30 August 2014 - 03:00 PM
What type of lifters and rockers are they ? solid or hydraulic ? , adjustable or non adjustable ? did you bleed the lifters ?
_glennhailstone_
Posted 30 August 2014 - 03:04 PM
Maybe its not the timing thats the issue, its just whether I have adjusted the roller rockers correctly.
I wasn't very confident when installing them, as i just went off youtube videos.
When you say check the key, and the dots. How likely is it that the key is in the wrong place, and how would this happen.
I think they are hydraulic lifters, if you can push the inner part of the lifter down and it comes back up does that mean its hydraulic. And no I didn't bleed the lifters, how do you do that??
Cheers
Edited by glennhailstone, 30 August 2014 - 03:07 PM.
CABIN ENGINE CONTROLS GALORE
Posted 30 August 2014 - 03:05 PM
and I just checked,
that the Cam driven gear key-way ( cam gear ),
is at around 1 O'clock,
when the dots are lined up too.
CABIN ENGINE CONTROLS GALORE
Posted 30 August 2014 - 03:09 PM
So basics for correct key positions:-
- crank key vertical
- camshaft key at 1 O'clock
those two pushrods look the same height,
if that is Top dead centre on #1
Forum Fixture
Posted 30 August 2014 - 03:25 PM
i leave the lifters facing upwards in a container of oil ( but there is other ways to bleed them)
_Bomber Watson_
Posted 30 August 2014 - 04:22 PM
CABIN ENGINE CONTROLS GALORE
Posted 30 August 2014 - 04:46 PM
Just checking DJ,
as I don't know if a Cam gear could have been made wrong,
or if the Dot was put in the right place.
Oh for frOcks sake the cam gear only has one keyway, you can only put it on the cam in one position.
Sheesh.
_glennhailstone_
Posted 30 August 2014 - 06:08 PM
Haha easy on there chief, I think I figured it out.
I took the rocker cover off and I think because it has a hot cam the balloon was inflating a little on at some stage of the exhaust stroke, which was putting me off.
Im not a cam expert, but I think it should be ok.. figures crossed.
frOcking balloons! Sorry, but Im paranoid about frOcking something, first time putting an engine together and this tosser on youtube said to use a balloon! hahaha
Start up soon,
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