make sure they're stuck in good - this is what happened when my S head dropped a seat...
more than just a replacement piston
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| Alloy head has dropped a valve seat https://www.ausmini.com/forums/viewtopic.php?f=2&t=80716 |
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| Author: | Minute [ Fri Mar 15, 2013 9:23 pm ] |
| Post subject: | Alloy head has dropped a valve seat |
Hi, had a call from a guy who wants to sell me an alloy 5 port head. Trouble is he lives far away and i wouldnt be able to inspect it in person before buying it. Dont know what make the head is. He said it was from Minisport All i know is the head was fitted to a 1380 race engine run on av-gas. He tells me one of the seats has come out and all i would need to do is get it put back in and away i go. Because it has come out already is this going to be a re-occurring problem? Looking for anyone who can shed any more light on this subject for me? also any other problems to look out for with 5 port alloy heads Thanks, Claeten |
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| Author: | TheMiniMan [ Sat Mar 16, 2013 10:51 am ] |
| Post subject: | |
need to see the head really may have got hot? |
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| Author: | awdmoke [ Sat Mar 16, 2013 10:54 am ] |
| Post subject: | |
Most of the 5 and 7 port alloy heads are made by Pierce Castings in the US regardless of who is selling. Poorly fitted seats are common. Not hard to rectify. You'd really need to see how much damage the seat did to the valve & head |
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| Author: | Minute [ Sat Mar 16, 2013 5:54 pm ] |
| Post subject: | |
awdmoke wrote: Most of the 5 and 7 port alloy heads are made by Pierce Castings in the US regardless of who is selling.
Poorly fitted seats are common. Not hard to rectify. You'd really need to see how much damage the seat did to the valve & head are they the ones that have the valve spring seat problems? how do you rectify it mike? |
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| Author: | awdmoke [ Sat Mar 16, 2013 7:17 pm ] |
| Post subject: | |
You just need to remove the inserts and shrink fit them properly. I'm considering going for bigger valves while I'm at it. |
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| Author: | 1071 S [ Sat Mar 16, 2013 7:25 pm ] |
| Post subject: | |
I would be careful - and ask for some decent photos of the outcome first. I bought an 1275GT motor that had had seats fitted - and one had fallen out. The consequences for the relevant piston and combustion chamber were not pretty.... The block was fine with a new piston - but the head was passed on as not worth the bother.... Valve seats are a LOT harder than alloy..... Cheers, Ian |
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| Author: | Minute [ Sat Mar 16, 2013 9:17 pm ] |
| Post subject: | |
it would always make a good ornament for the cabinet i suppose |
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| Author: | simon k [ Sat Mar 16, 2013 9:50 pm ] |
| Post subject: | |
make sure they're stuck in good - this is what happened when my S head dropped a seat...
more than just a replacement piston |
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