Head & Cam Cap Line Boring Specifications Needed

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04-05-2006 | 12:50 PM

Stan.Shaw@Excell.Net

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From: Wilbraham, MA

Head & Cam Cap Line Boring Specifications Needed

I have a set of S4 heads with mismatched cam caps. I need to get these line bored, and am wondering if anyone has the specifications on the diameter and length of the bore needed.

Thanks!

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04-05-2006 | 01:06 PM

Kevin in Atlanta

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From: Roswell, GA

Me too! Mine are 85-86 heads.

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04-05-2006 | 06:38 PM

atb

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From: Puyallup, WA

For all 5L 4 cam motors:

From page 26 of the Tech booklet:

Bore diameter for camshaft: 28 + 0.021 mm

Crankshaft diameter: 28 -0.04 / - 0.055 mm

Axial play 0.08- 0.18 mm

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04-05-2006 | 06:59 PM

Stan.Shaw@Excell.Net

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From: Wilbraham, MA

Thanks Adam, didn't even think to look there. I guess I can measure a head to figure out the length.

I have a local estimate to have this done for $400, does anyone know if this is good or bad?

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04-05-2006 | 07:20 PM

atb

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From: Puyallup, WA

$100 per line? Seems reasonable. Any machinests out there?

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04-05-2006 | 07:48 PM

Stan.Shaw@Excell.Net

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From: Wilbraham, MA

Thanks Sterling, I guess for $400 I hope they do it right.... Anything special about doing the 928 heads as opposed to other motors?

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04-06-2006 | 01:18 AM

atb

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From: Puyallup, WA

Might be worth calling and getting a quote for a typical Japanese aluminimum head DOHC 4 banger. If its less than $200 than you've got your answer.

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04-06-2006 | 05:48 AM

Ian928

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From: Kristiansund, Norway

I have a damaged cam cap too - and was wondering about this procedure. Would it not be necessary to grind down the mounting surfaces before boring? If not, I can't see how you would get any metal to bore from...

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