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#21211 05/12/2004 1:36 AM | Joined: May 2004 Posts: 30 Member | | Member Joined: May 2004 Posts: 30 | Anyone know how to adjust the 235 engine valve lash correctly? My truck has some "ticking" all the time and i think it's the valve lash. I also bent a push rod on one cylinder recently and a valve spring broke on another cylinder. I have replaced both but I think it has too much lash and it's starting to ruin parts. thanks, kyle | | |
#21212 05/12/2004 2:00 AM | Joined: Feb 2004 Posts: 29,880 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,880 | The most accurate valve adjustment method is called the "companion cylinder" method. It's done with the engine stopped, with two cylinders at the top of the stroke (top dead center). #1 and #6 come to the top at the same time, ditto #2 and #5, and #3 and #4. The firing order is 1-5-3-6-2-4, so the simple way to identify "companion" cylinders is to cut the firing order in half, like so:
1-5-3
6-2-4
The cylinders above each other reach TDC at the same time, one on compression (both valves closed), and the other on exhaust, (intake opening, exhaust closing). Turn the engine by hand and watch the #6 valves. Get them "rocking" exhaust closing, and intake opening, and adjust the #1 valves to specification. Rock #2, adjust #5. Rock #4, adjust #3. Continue down the firing order until all cylinders are adjusted. Warm the engine up, and recheck the clearances. If you adjust the valves about .002" looser than the "hot" specifications with the engine cold, the hot clearance should be about right. Confused yet?
Jerry
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#21213 05/12/2004 4:31 AM | Joined: May 2004 Posts: 30 Member | | Member Joined: May 2004 Posts: 30 | Nah, it sounds logical to me, What's the spec for intake and exhuast? | | |
#21214 05/12/2004 3:34 PM | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | | | |
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