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That seems correct. The only thing that surprises me is that #3 intake valves are open. At the bottom of the stroke, after intake, the valves need to be closed(or extremely near closed) so that compression can begin.
If they are still open, even a little, after BDC, the air-fuel mixture gets pushed back into the intake manifold.
You may want to verify that the timing is correct, it may be a tooth off.
So that means #1 intake is open at BDC also, when #3 is at TDC.
This supports the theory that the #3 intake valve(s) are burnt or otherwise not sealing.
And the oil didn't help much this time, suggesting maybe the problem is not the rings.
Thank you, RJ_RS_SS_350. Let me doublecheck #1 at TDC again and also what happened when #3 is at TDC. I will get back here with the picture as soon as possible.
Since it has VVT the valve may be doing unexpected thing when not running?
I don't think the VVT is active, needs oil pressure to do anything. Here's what DrLoch said about VVT
Originally Posted by DrLoch
The VVT sprockets are spring loaded to a straight up center position, the VVT solenoids direct oil pressure to the sprockets to vary the valve timing one way or another from the straight up mechanical setting.
I don't fully understand what that means. I think it might be magic.
I would think VVT would really only affect the valves near TDC, but I don't know that. Holding the exhaust valves open a little longer, opening the intake valves a little early. Something like that, but I'm only guessing.
I redid the test again. This time when 1 is at TDC, 3's intake valves look a little bit opened and going to be closed. 3's exhaust valves are closed. See the pictures of 3. The following is for the intake of 3.
I redid the test again. This time when 1 is at TDC, 3's intake valves look a little bit opened and going to be closed. 3's exhaust valves are closed. See the pictures of 3. The following is for the intake of 3.
The timing marks should be at 10 o'clock(exhaust) and 2 o'clock(intake) on the cam shaft sporckets(actuators). Should be lined up with the colored links of the chain.
I found when 3 was at the top, 1's exhaust valves were already a little bit opened and going to be opened. If I made 1's exhaust valves were closed but not opened yet, 2's exhaust valves were still a little bit opened and going to be closed.
Anyway, in both cases, I did leakdown testing on 3. I could feel the air flow out from the hole that had the exhaust valves opened .I put the spark plugs back to the 1 and 2 holes just to stop he air flow, then I could feel the air come out from the tail pipeline.
The timing marks should be at 10 o'clock(exhaust) and 2 o'clock(intake) on the cam shaft sporckets(actuators). Should be lined up with the colored links of the chain.
Yeah, I saw the marks but didn't find the colored links of the chain.
04-14-2018, 12:58 PM
