My friend has a 1936 Packard 120 with an aluminum head that has 10MM x 1.0 pitch spark plug threads. One of the plug threads is stripped. The car uses Champion UY6 plugs which have a reach of only ¼ inch. We are having difficulties finding a 10MM plug repair kit that has 1.0 thread pitch and especially one that includes sleeves that are only ¼ inch long. Suggestions would be most appreciated.
Spark plug hole repair, 10MM x 1.0
- Thread starter flanso
- Start date
You sure about an aluminum head? https://www.conceptcarz.com/s12940/packard-one-twenty.aspx
Yes, it's aluminum.
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What year did Packard make aluminum heads?
I bought a aluminum head that I thought it would fit my 51 Packard 327 s8, but when I received it it was to small!! So I'm guessing that this head is for the smaller s8. So does anybody here know when packard make the aluminum cylinder head and are they good to install or junk. This is just for m...
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Yes, Virginia, Packard had aluminum heads… and driver-adjustable suspension…90 years ago…
OP - Timesert makes exactly what you need. It’ll be about $120. Check the thread size, pitch, and insert length, here:
You’ll find that the 6.8mm insert length will be exactly what you need for that plug.
That said, get a good machine shop to do this. You want a precise, accurate job. Packard heads, particularly aluminum ones, are hard to come by. I’ve done lots of Timeserts, they’re great, but you can’t risk messing this one up.
For example, it may need the chamfer and plug seating surface around the spark plug hole recut when the Timesert is done.
OP - Timesert makes exactly what you need. It’ll be about $120. Check the thread size, pitch, and insert length, here:
++ TIME-SERT Metric Kits ++ thread repair kits and inserts repair stripped threads damaged threads repaired threads threaded inserts for metal thread inserts for metal aluminum inserts threaded inserts for aluminum
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www.timesert.com
You’ll find that the 6.8mm insert length will be exactly what you need for that plug.
That said, get a good machine shop to do this. You want a precise, accurate job. Packard heads, particularly aluminum ones, are hard to come by. I’ve done lots of Timeserts, they’re great, but you can’t risk messing this one up.
For example, it may need the chamfer and plug seating surface around the spark plug hole recut when the Timesert is done.
I dunno if it'll hold but I've trimmed HeliCoils with dykes before for less critical applications
But as suggested above, don't listen to me and potentially ruin something vintage and valuable
Which end do TimeSerts "swell" when fully seated (I can't remember)? Seems the opposing end could be machined down??
But as suggested above, don't listen to me and potentially ruin something vintage and valuable
Which end do TimeSerts "swell" when fully seated (I can't remember)? Seems the opposing end could be machined down??
If you dont want to pull the head and take it to a machinist (the best way if you dont have experience) this is a very simple in the car repair using the time sert kit Astro linked to, using a tap guide is highly recommended, the plug being a gasket washer type will not need machining if you install it flush. I would have someone with experience install it if you never did it before.
time-serts.com
Time-Sert Metric Tap Guides – SHOP TIME-SERT
time-serts.com
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