9n motor

hankviii · Jul 26, 2014

Rebuilding my 9n. Pulled everything apart and bought a rebuild kit from YT.com. Problem is my old sleeves have no shoulder on top and the outside diameter is ten thou larger than the new ones. What do I do now? Thanks for any info.
Seth

Royse · Jul 26, 2014

What are the measurements on your sleeves/bores?
I'm just wondering if you can use .090 sleeves.

hankviii · Jul 27, 2014

That is what I purchased. I called tisco to confirm part numbers. Thanks

Tom N MS · Jul 27, 2014

Tisco??? Could be the problem....Like Royse said,
please share tell us the measurements of bores and
sleeves..

mhb@ufe · Jul 27, 2014

Most likely a machine shop bored the engine and installed generic sleeves instead of using original size replacement sleeves.

Mark

hankviii · Jul 27, 2014

My old sleeves have an OD of 3.377
New sleeves from tisco have an OD of 3.367
My bore measures at 3.373. Is that not standard for a 9n unsleeved bore? My serial number appears to be 9NT98487. Thanks

Tall T · Jul 27, 2014

Can one buy a .010 oversized O.D. sleeve
or does one have to bore again to accommodate an available oversize?

TheOldHokie · Jul 28, 2014

(quoted from post at 19:37:40 07/27/14) My old sleeves have an OD of 3.377
New sleeves from tisco have an OD of 3.367
My bore measures at 3.373. Is that not standard for a 9n unsleeved bore? My serial number appears to be 9NT98487. Thanks

The nominal OEM cylinder bore on the N-series is 3.1875.

With .040 wall sleeves the nominal block bore is 3.1875 +.040 +.040 = 3.2675

With .090 wall sleeves the nominal block bore is 3.1875 + .090 + .090 = 3.3675

Your block bore is nominally .005 over stock .090 wall replacement sleeves. You can get .005 over sleeves that MAY work but you are dealing with an interference fit of .001 and on something non-standard like this there is always the chance that the interference fit will be loose. I don't know what YT's policy is on returning them if they will not work and at $42 each it's a $175+ investment. IMO your best bet is to take the block to a machine shop and let them fit custom sleeves.

[u:df8ce00ae2]Oversize Sleeves @YT[/u:df8ce00ae2]

TOH

hankviii · Jul 29, 2014

(reply to post at 05:10:54 07/28/14)

How do you know if your pistons/rings are too small for the sleeve?

9n motor

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