Hi All,
I'm new to the form, and hoping I can pick your brains for some expertise with some troubles I've recently run into with my car.
I have a 99 v6 mustang with 481,000 k on it, and for the most part its been an awesome car. Without getting too far into its history, around 250,000k a valve spring broke on the #2 exhaust, and we replaced it, and life as I knew it went on. Had no issues changing the spring back then.
I recently needed to remove the valve springs again, so I removed both intake/exhaust on #2, and #3 (see below for whole long story why), but when I goto tighten down the bolt for that rocker arm, with the respective piston for that cylinder at TDC, the rocker arm Is *actually* opening the valve (I know because I have the leakdown tester still connected at a LOW psi). I thought perhaps there are hydraulic lifters, and they need to bleed down, so I left it over night, but unfortunately no change. I tried spinning the engine over, but also no change.
... I've verified with a straight edge ruler all valves are sitting at the same height with the springs installed...
I can't for the life of me figure out what I've screwed up...
any suggestions on what might be wrong? Is there anyway to shim things? I realize what I've done below isn't by any means a fix, but at the moment I'd like to just get it going again, and consider cleaning it up in the warmer weather...
thanks - Jonathan
Below this point is the whole long story leading to this point.
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This is the original detail that started the issue - also sorry to link to another form, but I don't have the video link handy to post directly here.
The problem now, many KM later, the car has developed a weird sound at idle, but seemed OK under WOT.
See video here (http://www.sn95source.com/topic/580...kazoo-now-suspect-broken-intake-valve-spring/ ); notice towards end of video I hold some paper towel upto the intake manifold, which actually is blowing air out.... not good.
... after a suggestion from some members on another form, I did a compression test and a leakdown test.
compression test looked OK;
190-180-190-185-190-185 (order front to back drivers side, then psgr side).
However I noticed an issue with the leakdown test, the back 2 cylinders on the passenger side showed issues, one leaked 50 psi, and the other leaked down about 20 psi.
At the time I had the intake manifold off, and could hear and feel the air escaping through the intake port. I had removed the rocker arms overtop and tried to wiggle and push on the valve to see if there was any difference or change but there was none.
Anyways, I can see the valve is leaking, I decide to try spinning the valve while its still in the cylinder head, after doing this I am able to eventually get the cylinder to hold 65 psi, while putting in about 71 psi, so the leakdown test shows good.
And now I am having difficulties reinstalling the rocker arms as they are opening the valves when I tighten them down with that cylinder at TDC.
I'm new to the form, and hoping I can pick your brains for some expertise with some troubles I've recently run into with my car.
I have a 99 v6 mustang with 481,000 k on it, and for the most part its been an awesome car. Without getting too far into its history, around 250,000k a valve spring broke on the #2 exhaust, and we replaced it, and life as I knew it went on. Had no issues changing the spring back then.
I recently needed to remove the valve springs again, so I removed both intake/exhaust on #2, and #3 (see below for whole long story why), but when I goto tighten down the bolt for that rocker arm, with the respective piston for that cylinder at TDC, the rocker arm Is *actually* opening the valve (I know because I have the leakdown tester still connected at a LOW psi). I thought perhaps there are hydraulic lifters, and they need to bleed down, so I left it over night, but unfortunately no change. I tried spinning the engine over, but also no change.
... I've verified with a straight edge ruler all valves are sitting at the same height with the springs installed...
I can't for the life of me figure out what I've screwed up...
any suggestions on what might be wrong? Is there anyway to shim things? I realize what I've done below isn't by any means a fix, but at the moment I'd like to just get it going again, and consider cleaning it up in the warmer weather...
thanks - Jonathan
Below this point is the whole long story leading to this point.
//////////////
/////////////
This is the original detail that started the issue - also sorry to link to another form, but I don't have the video link handy to post directly here.
The problem now, many KM later, the car has developed a weird sound at idle, but seemed OK under WOT.
See video here (http://www.sn95source.com/topic/580...kazoo-now-suspect-broken-intake-valve-spring/ ); notice towards end of video I hold some paper towel upto the intake manifold, which actually is blowing air out.... not good.
... after a suggestion from some members on another form, I did a compression test and a leakdown test.
compression test looked OK;
190-180-190-185-190-185 (order front to back drivers side, then psgr side).
However I noticed an issue with the leakdown test, the back 2 cylinders on the passenger side showed issues, one leaked 50 psi, and the other leaked down about 20 psi.
At the time I had the intake manifold off, and could hear and feel the air escaping through the intake port. I had removed the rocker arms overtop and tried to wiggle and push on the valve to see if there was any difference or change but there was none.
Anyways, I can see the valve is leaking, I decide to try spinning the valve while its still in the cylinder head, after doing this I am able to eventually get the cylinder to hold 65 psi, while putting in about 71 psi, so the leakdown test shows good.
And now I am having difficulties reinstalling the rocker arms as they are opening the valves when I tighten them down with that cylinder at TDC.