Valve clearance after head work? - Defender Source
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  #1  
Old July 11th, 2013, 08:56 AM
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Keith Armstrong
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Valve clearance after head work?

I may have spoken too soon about "success" on re-assembling the '97 4.0

It's got what sounds like excessive valve clearances.

I phoned the machine shop and asked how much they took off from the deck face when they freshened the heads / did the valve work.

Shop Guy - "Gee, we don't really know, but we always take the same amount off the valve stems so your clearances stay the same."

Me - "Well gosh Bubba, that sounds great, except my rocker ratio isn't 1:1."

Shop guy - "Oops."

Crap...sounds to me as though I need to

(1) determine if clearances are too much / too little;

(2) Too little would seem to be unlikely, but the solution is probably shimming the rocker pedestals up a bit;

(3) Too much clearance seems more likely and could likely be fixed by taking a bit off the rocker pedestals, no?

Oh, and I wouldn't suggest Harvey's Machine Shop in Norwalk, IA.
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  #2  
Old July 11th, 2013, 09:18 AM
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Bill Adams
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You really don't want to know how much a full set of valves is going to cost. The stems shouldn't be shaved due to the hardening. Removing the "shell" of hardened steel on the stem ends is going to kill them.
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  #3  
Old July 11th, 2013, 09:29 AM
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get some "lash caps".
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  #4  
Old July 11th, 2013, 09:41 AM
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If I need new valves, Harvey just bought them

Quote:
Originally Posted by Uncle Douglas View Post
get some "lash caps".
Oooo, I like that idea.

Thoughts on sources?
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  #5  
Old July 14th, 2013, 10:29 AM
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How long have you run the motor since reassembling it? If not that long then you might just have not let the lifters refill. They will quiet down. Some take longer then others depending on how long you left your rockers in the wash tank. Don't rev the motor but just let it run and get up to temp before you freak out. As long as you got oil pressure then you are okay. Hence the name "hydraulic lifters". After a headjob I fire them up and let them get warm and collect all the little bit of spooge that might have made it's way down into the motor. Then shut it down and drop the oil out it.
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Old July 14th, 2013, 10:41 AM
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Quote:
Originally Posted by UnfrozenCaveman View Post
I may have spoken too soon about "success" on re-assembling the '97 4.0

It's got what sounds like excessive valve clearances.

I phoned the machine shop and asked how much they took off from the deck face when they freshened the heads / did the valve work.

Shop Guy - "Gee, we don't really know, but we always take the same amount off the valve stems so your clearances stay the same."

Me - "Well gosh Bubba, that sounds great, except my rocker ratio isn't 1:1."

Shop guy - "Oops."

Crap...sounds to me as though I need to

(1) determine if clearances are too much / too little;

(2) Too little would seem to be unlikely, but the solution is probably shimming the rocker pedestals up a bit;

(3) Too much clearance seems more likely and could likely be fixed by taking a bit off the rocker pedestals, no?

Oh, and I wouldn't suggest Harvey's Machine Shop in Norwalk, IA.
What part of oops is the shop going to contribute to fixing their mistake?
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  #7  
Old July 14th, 2013, 10:49 AM
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usually used with high lift cams but will work with your problem as well. Tdi's use them. Page 14

http://www.iskycams.com/onlinecatalog.html
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  #8  
Old August 12th, 2013, 10:40 PM
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Okay...I'ge been distracted.

Finally got the top off the engine again.

Cleaned out the litters so I could check clearances between the pushrod cup and retaining clips.

I made wire feelers that are 20 / 40 and 60 thousandths.

Sixty is a squirt loose in all of them.

Who's got a source for the rocker stand shim?
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  #9  
Old August 13th, 2013, 10:17 AM
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I made my own shims-- shim stock is very easy to find-- I picked up some brass stock and cut my own. I shim every time I rebuild to dial stuff in. Very typical-- so many people never even check. Sort of a kin to how people don't check swivel ball preload until they know better...
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  #10  
Old August 13th, 2013, 10:26 AM
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You don't think the brass is too soft?

I can get that / copper easily locally, but I thought it might not hold up over time???
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