Intake valve wont close, fails leak down test
#21
#23
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Location: Crossroads of America
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#24
You say you can feel the air escaping. Are you able to look in the intake port and see if there is anything obstructing the intake valves? Otherwise it may need to come back off. Have you checked the other head with the head upside down, and put some solvent in it to see if that leaks down?
#25
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Don B (04-24-2017)
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Don B (04-24-2017)
#27
The valve lap is literally one sweep once each way - just touched with very fine paste. It's so easy to do too much.
Did they re-use the valve? Did they replace the guide? Did they even test it? Take it back.
The cylinder head bolts are 2 use.Once when the factory set them, second when a head gasket fails, technician guideline is to centre punch the top of each bolt so they know it's 2nd round use. As they stretch I'd be inclined to buy new if you don't know how many times they've been torqued up.
I used to recommend calling at the local Land Rover dealer as the AJV8 in those cars is a Jaguar unit and shares the bolts, but at a fraction of the cost. Sadly in the UK at least their prices are now in-line with Jaguar.
Head gaskets, again up to you - if your surfaces are surgical clean on install, then reuse them.
Did they re-use the valve? Did they replace the guide? Did they even test it? Take it back.
The cylinder head bolts are 2 use.Once when the factory set them, second when a head gasket fails, technician guideline is to centre punch the top of each bolt so they know it's 2nd round use. As they stretch I'd be inclined to buy new if you don't know how many times they've been torqued up.
I used to recommend calling at the local Land Rover dealer as the AJV8 in those cars is a Jaguar unit and shares the bolts, but at a fraction of the cost. Sadly in the UK at least their prices are now in-line with Jaguar.
Head gaskets, again up to you - if your surfaces are surgical clean on install, then reuse them.
Last edited by Sean B; 04-24-2017 at 01:42 PM.
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Don B (04-24-2017)
#28
NEVER MIND
bob
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Don B (04-24-2017)
#29
You'd be surprised what a head repair shop can miss. I had one give me bolts that were for a another brand of vehicle ( I had priced genuine ) because my team leader wanted to save the customer money. I was assured they would work, but was my mistake for not double checking. You'd think that a shop that specialises in a certain area, you wouldn't have to double check their work, but turns out you do. I put them in, and it felt like it was torqued properly, but after was all back together, it was running a bit rough. The bolts had a shoulder on it slightly bigger than the genuine ones near the top of the bolt, and didn't pass through the head freely. So I had to take the head back off, to find out the bolts supplied weren't going to work. The owner of the shop came by to inspect what the problem was, and basically shrugged his shoulders, looked at my team leader and said " he should have checked that before installing ". Sadly the dealership still uses him for cylinder head repairs, fortunately for me I'm not in that workshop anymore.
#30
#31
This is why I stick with genuine. When I was still living in Texas, I didn't have this problem. When I came to NZ, they send a lot of rebuild work out the door to someone else. Had I been the team leader, this wouldn't have happened, luckily the manager at the time took care of me. This is the same workshop that left a crank pulley loose on a X308 engine rebuild job ( this was before I started working there ).
I later found out the wrong head bolt incident wasn't the first time it happened. This is why it's so important to know when to buy genuine and when you can go aftermarket. Also, no matter how reputable the company is, you still have to double check and even triple check work, specially with such a big job knowing what the consequences could be. At the end of the day we are all still human.
I later found out the wrong head bolt incident wasn't the first time it happened. This is why it's so important to know when to buy genuine and when you can go aftermarket. Also, no matter how reputable the company is, you still have to double check and even triple check work, specially with such a big job knowing what the consequences could be. At the end of the day we are all still human.
#32
#34
Looks like something fell into chamber. If you don't have a valve spring compressor put the cam back on and turn it until that valve opens up. Then remove the debris and look for damage on valve or seat. When that is O.K.
install a spark plug in that cylinder. Turn it upside down and put a fluid in that cylinder with the valves closed. Look for any leaks in the intake and exhaust ports. Cleaning solvent is what I use.
install a spark plug in that cylinder. Turn it upside down and put a fluid in that cylinder with the valves closed. Look for any leaks in the intake and exhaust ports. Cleaning solvent is what I use.
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Don B (04-29-2017)
#37
Talked to the machine shop, they said it was most likely their machine or the setup they had. They don't do jaguar engine heads very often and the valves are very very small compared to the valves normal engines have. They are willing to fix the heads and have me there to watch them do solvent and pressure tests on it and they are offering to replace all the seals I've used and anything else. I might try and get a little extra something out of them too, I spent a lot of time pulling my heads off and putting them.back on and then having to pull them back off. Keep in mind this is with the engine still in place. Just saying, have a 12 pack handy when trying to remove or put back the exhaust bolts. They give you one hell of a time.
#38
#39
Looks like something fell into chamber. If you don't have a valve spring compressor put the cam back on and turn it until that valve opens up. Then remove the debris and look for damage on valve or seat. When that is O.K.
install a spark plug in that cylinder. Turn it upside down and put a fluid in that cylinder with the valves closed. Look for any leaks in the intake and exhaust ports. Cleaning solvent is what I use.
install a spark plug in that cylinder. Turn it upside down and put a fluid in that cylinder with the valves closed. Look for any leaks in the intake and exhaust ports. Cleaning solvent is what I use.
#40