Worn guides
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| Valves leaking ? https://ausmini.com/forums/viewtopic.php?f=2&t=94321 |
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| Author: | mini-dunger [ Tue Nov 29, 2016 2:53 pm ] |
| Post subject: | Valves leaking ? |
Hi all I have been battling a engine miss. I've ruled out electrical so I pulled the head off. Because I suspect a burnt valve. The valves look ok. I made up a plate with a rubber seal to blank off the combustion chamber. I put 100psi in the spark plug hole. I then tested each cylinder. The first cylinder was leaking into the inlet valve the second cylinder was the exhaust valve and a little into the inlet. The third one was leaking out both valves and the fourth was leaking mostly from the exhaust. There is no obvious cracks or dAmage. I just assuming the valve seats need a lap. This brings me to my question.... Is this a fairly common thing to happen? |
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| Author: | drmini in aust [ Tue Nov 29, 2016 3:20 pm ] |
| Post subject: | Re: Valves leaking ? |
If the valve faces are concave at all they need refacing, not just lapping. Ditto the seats in the head if marked. Strip and clean the head then take to an engine reco shop, they have the gear to face valves and seats. Shouldn't be too expensive. But if the valves are getting thin I'd just replace them, they are cheap these days. But do get the seats in the head recut. You had better check the valve guides too, if worn I'd replace them first. |
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| Author: | 9YaTaH [ Tue Nov 29, 2016 4:15 pm ] |
| Post subject: | Re: Valves leaking ? |
Worn guides
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| Author: | mini-dunger [ Tue Nov 29, 2016 4:31 pm ] |
| Post subject: | Re: Valves leaking ? |
Okie dokie. I will get it looked at. I will see how they are worn. It really hasn't done that many kms. I will check the guides. |
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| Author: | mini-dunger [ Tue Nov 29, 2016 9:00 pm ] |
| Post subject: | Re: Valves leaking ? |
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| Author: | mini-dunger [ Tue Nov 29, 2016 9:02 pm ] |
| Post subject: | Re: Valves leaking ? |
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| Author: | mini-dunger [ Tue Nov 29, 2016 9:06 pm ] |
| Post subject: | Re: Valves leaking ? |
That valve is an inlet valve. They kinda all looked like that. There was no thinning or real damage. All I found was the nic and corresponding mark on an inlet valve. The seats although dirty were pretty flat still. If I can get the valve and the seat cleaned up everything should be sweet?. There was no side to side slop in the valve guides either..... The exhaust valves were in better shape and cleaner than the inlet valves... You can see by the top photo how grubby they were. |
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| Author: | 9YaTaH [ Fri Dec 02, 2016 7:14 am ] |
| Post subject: | Re: Valves leaking ? |
mini-dunger wrote: Okie dokie. I will get it looked at. I will see how they are worn. It really hasn't done that many kms. I will check the guides. I tiny bit of oil weeping down a guide may result in clouds of blue smoke, every now and then on start-up, especially after the car has been sitting for a few days... |
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