Leaking intake/exhaust valves?
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Teching In
Joined: Mar 2017
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Leaking intake/exhaust valves? Hello forum,
So I did a port job on my 241 heads and I just finished. I Put back all the valves back the way they were originally back in the same positions that I took them out. I put the spark plugs back in as well and filled the combustion chamber with water. After 30 minutes or so I checked the intake and exhaust ports and I see small driblets of water in only 3 of the intake ports of only one cylinder head. Obviously there is a small leak. Is it a big deal to fix or should I be fine?
So I did a port job on my 241 heads and I just finished. I Put back all the valves back the way they were originally back in the same positions that I took them out. I put the spark plugs back in as well and filled the combustion chamber with water. After 30 minutes or so I checked the intake and exhaust ports and I see small driblets of water in only 3 of the intake ports of only one cylinder head. Obviously there is a small leak. Is it a big deal to fix or should I be fine?
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Joined: Nov 2011
Posts: 609
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From: jacksonville,fl
I would never drop a valve back in without at the least doing an old fashioned valve lapping job with grinding compound & a suction cup to spin the valve back & forth.
But for max power, having a shop do a proper 3 angle valve job will ensure a few more horsepower over diy.
But for max power, having a shop do a proper 3 angle valve job will ensure a few more horsepower over diy.
I agree, I always lap my valves before the heads go on the car. Even do this with brand new heads. Lapping will also tell you you have a nice even contact surface. Just make sure to really clean the heads good afterwards so none of the lapping compound remains. There was a thread on here about lapping about a month ago.
I agree. Lap those valves. All of them.
Do the problem cylinder last since you'll get better from beginning to end
Do a search for Valve Lap using a Drill. I've always done it this way too and it works great and fast.
Take a look at the valve seat and the valve for a nice shiny new surface where the valves have seated in good.
Then reinstall and check again...
Good luck
Do the problem cylinder last since you'll get better from beginning to end
Do a search for Valve Lap using a Drill. I've always done it this way too and it works great and fast.
Take a look at the valve seat and the valve for a nice shiny new surface where the valves have seated in good.
Then reinstall and check again...
Good luck
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Joined: Mar 2013
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Hello forum,
So I did a port job on my 241 heads and I just finished. I Put back all the valves back the way they were originally back in the same positions that I took them out. I put the spark plugs back in as well and filled the combustion chamber with water. After 30 minutes or so I checked the intake and exhaust ports and I see small driblets of water in only 3 of the intake ports of only one cylinder head. Obviously there is a small leak. Is it a big deal to fix or should I be fine?
So I did a port job on my 241 heads and I just finished. I Put back all the valves back the way they were originally back in the same positions that I took them out. I put the spark plugs back in as well and filled the combustion chamber with water. After 30 minutes or so I checked the intake and exhaust ports and I see small driblets of water in only 3 of the intake ports of only one cylinder head. Obviously there is a small leak. Is it a big deal to fix or should I be fine?
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