checking compression release on 14.5 b &s

dougmartin · 06-18-2009, 10:18 PM

first time user
Lots of question on intek motors not turning over, like to much compression. I have been working on mine for a week,this is a list of what i have done.
1. checked fly wheel and key
2. changed starter
3. replaced battery
4. checked voltage when starting (9.6)
5. adjusted valves .003 intake .005 exhust
6. replaced cam shaft (looked good not wore replaced any way)
7. checked compression 150 psi
8. adjust exhust valve till compresion guage read 120 psi

started good,about 10 times than same old problem.is there a compression release and if so how do i check it and can i adjust it? please help me!
THANKS FOR YOUR TIME

**Basementgeek** · 06-19-2009, 07:37 AM

Hi and welcome to the forum

If it started 10 times and the 11th time it did not, maybe battery voltage was to low.

The compression release is built into the cam shaft.

Seen else were:

Quote:

Remove the valve cover then rotate the engine over by hand until you reach top dead center compression stroke, Then remove the spark plug. Once at TDC insert a small screw driver in the plug hole touching the piston and rotate clockwise past TDC until you see the screw driver move down inside the hole 1/4". Now loosen the jam screw in the center of the adjustment nut and adjust to .005-.007(?)" both intake and exhaust. Hold the adjuster nut with your wrench while tightening the jam screw. It may take a couple times to get it right because when tightening the jam screw it could throw the adjustment out so check after tightening.

http://www.lawnsite.com/archive/index.php/t-174278.html

Let know how it works out for you.

BG

k2skier · 06-20-2009, 10:01 PM

Look at all grounds and cables and connections. Try jumping a good car battery straight to the starter.

Is the valve clearance staying the same? I've seen rocker studs come loose.

mstpops · 11-18-2009, 12:40 AM

ascertain tdc - use clean screw driver through plug hole and slowley rotate engine by hand until screw driver will not move any higher than the piston can push it did you set the inlet and ex vales to 0.003" and 0.005" @ 1/4 inch past tdc on power stroke to make the decompressor cam in effective while settiong the tappetts if this does not work try

rotate the engine and watch which one opens and then closes the valve a fraction while the piston is comming up on compression stroke then rotate it backward till it closes the rotate slightly forward until you just see the valve start to make the decompressor action stop then just make the tappett setting for that valve a fraction closer and tighten the loc nut while holding that crank and valve setting in that position

cheers

06-18-2009, 10:18 PM	#1 (permalink)
dougmartin Registered User Join Date: Jun 2009 Posts: 1 OS: win98	checking compression release on 14.5 b &s first time user Lots of question on intek motors not turning over, like to much compression. I have been working on mine for a week,this is a list of what i have done. 1. checked fly wheel and key 2. changed starter 3. replaced battery 4. checked voltage when starting (9.6) 5. adjusted valves .003 intake .005 exhust 6. replaced cam shaft (looked good not wore replaced any way) 7. checked compression 150 psi 8. adjust exhust valve till compresion guage read 120 psi started good,about 10 times than same old problem.is there a compression release and if so how do i check it and can i adjust it? please help me! THANKS FOR YOUR TIME

06-20-2009, 10:01 PM	#3 (permalink)
k2skier Registered User Join Date: Sep 2008 Location: Oregon Posts: 313 OS: XP Home-SP3 My System	Re: checking compression release on 14.5 b &s Look at all grounds and cables and connections. Try jumping a good car battery straight to the starter. Is the valve clearance staying the same? I've seen rocker studs come loose. Last edited by k2skier; 06-20-2009 at 10:08 PM.

11-18-2009, 12:40 AM	#4 (permalink)
mstpops Registered User Join Date: Oct 2009 Posts: 18 OS: xp	Re: checking compression release on 14.5 b &s ascertain tdc - use clean screw driver through plug hole and slowley rotate engine by hand until screw driver will not move any higher than the piston can push it did you set the inlet and ex vales to 0.003" and 0.005" @ 1/4 inch past tdc on power stroke to make the decompressor cam in effective while settiong the tappetts if this does not work try rotate the engine and watch which one opens and then closes the valve a fraction while the piston is comming up on compression stroke then rotate it backward till it closes the rotate slightly forward until you just see the valve start to make the decompressor action stop then just make the tappett setting for that valve a fraction closer and tighten the loc nut while holding that crank and valve setting in that position cheers