Hey guys, I just replaced the valve guides on a 12g295 head. I used cast iron guides, and though opinion seems to be very much divided on the subject, I was under the impression that these would not need reaming to size. However, now that they are fitted in the head the valves seem reaaaaallly tight. I can just about insert them all by hand and i know they are supposed to be tight when new, but it seems like too much... Does this mean I will need to get them reamed?
Replacement Valve Guides Very Snug On Valves!
Started by
beentheunseen
, Mar 12 2010 11:46 PM
2 replies to this topic
#1
beentheunseen
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Mini Mad
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Posted 12 March 2010 - 11:46 PM
#2
MRA
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Previously known as 'mra-minis.co.uk'.
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Posted 12 March 2010 - 11:59 PM
Not reamed..... definately NOT reamed, there are a couple of ways of dealing with this type of issue, firstly do not force the valves in to the guides again 
find a local company that can correct them using the right tools for the job....
A reamer NEEDS at least 0.003" to work as the guides where machined as a perfect fit to the valves before fitting in the head, you will only need to take out about 0.0003" a reamer will simply "bounce" around in the hole and create more damage
The better the job the longer it will last
giving you more miles per £ and less hassle
find a local company that can correct them using the right tools for the job....
A reamer NEEDS at least 0.003" to work as the guides where machined as a perfect fit to the valves before fitting in the head, you will only need to take out about 0.0003" a reamer will simply "bounce" around in the hole and create more damage
The better the job the longer it will last
giving you more miles per £ and less hassle
#3
beentheunseen
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- Members
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- 200 posts
Mini Mad
- Local Club: Notts about Minis
Posted 13 March 2010 - 12:11 AM
Not reamed..... definately NOT reamed, there are a couple of ways of dealing with this type of issue, firstly do not force the valves in to the guides again
find a local company that can correct them using the right tools for the job....
A reamer NEEDS at least 0.003" to work as the guides where machined as a perfect fit to the valves before fitting in the head, you will only need to take out about 0.0003" a reamer will simply "bounce" around in the hole and create more damage
The better the job the longer it will last
Coolio, anybody know anybody good in the Nottingham area?
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