Hello all. I am wondering if anyone can tell me would a cracked exhaust manifold lessen an engine"s power? I have a super H, which I did a compression test on, and all of the cylinders are within four pounds of each other, and all are above 130 pounds. Does this seem good? In general the tractor does not seem to have as much power as it used to. The tractor is very loud, and I believe it to have a cracked exhaust manifold. Would this explain the power loss? Do any of you have any other ideas?
- Thread starter holmesw
- Start date
Fritz Maurer
Well-known Member
No loss from a cracked exhaust. Other ways to lose power: Dirty air cleaner,fouled plugs, faulty ignition, water in fuel... was the power loss sudden or gradual? compression is very good, you can rule out basic engine assem. as culprit. Do some basic maintenance and you may solve it .
Tom Fleming
Well-known Member
Your compression numbers are fine. Crack in the exhaust, as other have stated will not reduce power.
Fritz hit it dead on.
Fritz hit it dead on.
tractorsam
Well-known Member
I'm with the check your timing crowd. If it's slipped a bit it will both make the tractor loud and low on power. Sam
Agreed with others on the timing.
However, the loudness could certainly be due to the crack in the exhaust manifold, not some other engine issue. So it's hard to point to that as a symptom of a timing issue.
Check the timing and distributor cam of course, as others have suggested. But I'd also recommend adjusting your valves.
If your distributor's good, valves are adjusted, and you're still having trouble, I'd move on to ignition components - points, condensor, etc.
Basically, I'd use this as a good excuse to do a full tune up.
And one final note - how long has the manifold been cracked? And where is it cracked?
It's possible for the crack to cause trouble with your valves, especially an exhaust valve - they can get burnt out.
It's good that your compression numbers are solid, but even so, I wouldn't run with that manifold for too much longer.
It's easy to say "just go buy a new one" but if funds are tight, I would, at an absolute minimum, goop up some jb weld on the crack to seal it.
However, the loudness could certainly be due to the crack in the exhaust manifold, not some other engine issue. So it's hard to point to that as a symptom of a timing issue.
Check the timing and distributor cam of course, as others have suggested. But I'd also recommend adjusting your valves.
If your distributor's good, valves are adjusted, and you're still having trouble, I'd move on to ignition components - points, condensor, etc.
Basically, I'd use this as a good excuse to do a full tune up.
And one final note - how long has the manifold been cracked? And where is it cracked?
It's possible for the crack to cause trouble with your valves, especially an exhaust valve - they can get burnt out.
It's good that your compression numbers are solid, but even so, I wouldn't run with that manifold for too much longer.
It's easy to say "just go buy a new one" but if funds are tight, I would, at an absolute minimum, goop up some jb weld on the crack to seal it.
Janicholson
Well-known Member
A crack that passes through the intake manifold interface where they attach together, will affect power, and starting. If the crack is away from there it will not. Jim
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