Retro-Renault Archive Forum Index  
SEARCH THE ARCHIVE FORUMS  •  Log in
Hello, you are currently browsing to Retro-Renault Archive which is a copy of our old forum. You cannot post replies in this forum. Please click here to go to the active website. 
 Head sanding?
Author Message
huwwatkins
Site Subscriber

Joined: 10 Jun 2004
Posts: 2317

Posted: Fri Mar 18, 2005 11:26 am

Popped out today and stuck the flat side of a metal saw up against the head. All looks very flat, not warping from what i can see. So i take it all i need to do now is give it a good sand to get all the crap off and whack it back on with a new gasket?
Chris H
Forum Moderator

Joined: 02 Mar 2004
Posts: 19978

Posted: Fri Mar 18, 2005 11:35 am

don't sand it.

Go buy a green scotchbrite pad from B&Q, use the palm of your hand and go across the lot.
huwwatkins
Site Subscriber

Joined: 10 Jun 2004
Posts: 2317

Posted: Fri Mar 18, 2005 11:56 am

Scotchbrite pad? What about cleaning off the valve faces and surrounding area?
pringe
Level 5 User

Joined: 28 Dec 2004
Posts: 110

Posted: Fri Mar 18, 2005 12:09 pm

a related question - if the head is not gonna be stripped, is it still worth cleaning out the valve faces and the dome area?
JB
Mr Quoter-vator

Joined: 16 Feb 2004
Posts: 7405

Posted: Fri Mar 18, 2005 3:29 pm

use a wire brush with thinners in the combustion chamber and on the valves "if u really want to" tbh it will be like that again in a few weeks.
huwwatkins
Site Subscriber

Joined: 10 Jun 2004
Posts: 2317

Posted: Fri Mar 18, 2005 5:07 pm

Better a few weeks worth of shit than 14 years tho?Razz
Neal
Forum Moderator

Joined: 18 Feb 2004
Posts: 7432

Posted: Fri Mar 18, 2005 5:15 pm

i had to put my valves in a lathe and use a file on em to get 11 years worth off. Especially the exhaust ones. Cant see scotchbrite doing it anytime this century tbh
huwwatkins
Site Subscriber

Joined: 10 Jun 2004
Posts: 2317

Posted: Fri Mar 18, 2005 5:57 pm

Was thinking of using my dremel with some sanding attachements to get them clean, but that sounds like it could be a bit dodgy. Could always try some cilit bang! Laughing
huwwatkins
Site Subscriber

Joined: 10 Jun 2004
Posts: 2317

Posted: Sat Mar 19, 2005 8:17 am

Right, been cleaning with some scotchbirte pads i found under the sink, not sure if its clean enough?

Image

Image
Chris H
Forum Moderator

Joined: 02 Mar 2004
Posts: 19978

Posted: Sat Mar 19, 2005 1:29 pm

maybe I work on heads and so on for no reason and don't know what I'm talking about, sorry I won't bother!
huwwatkins
Site Subscriber

Joined: 10 Jun 2004
Posts: 2317

Posted: Sat Mar 19, 2005 1:50 pm

er...? i cleaned it up with scotchbrite pads like you suggested, just want to know if you think its clean enough.
Doc
Site Subscriber

Joined: 11 Feb 2005
Posts: 2929

Posted: Sat Mar 19, 2005 2:33 pm

not a happy chapy today chris??
schakal
Spammer

Joined: 27 Jul 2004
Posts: 5717

Posted: Sat Mar 19, 2005 2:38 pm

he certainly is not

i thought chet would be more likely to be depressed after the welsh kickin ass in millenium today
Doc
Site Subscriber

Joined: 11 Feb 2005
Posts: 2929

Posted: Sat Mar 19, 2005 2:39 pm

Laughing
BenR
Level 5 User

Joined: 18 Jun 2004
Posts: 114

Posted: Sat Mar 19, 2005 4:22 pm

Checking flatness with a metal saw?

Precision straight edges dont even alow you to see warp or twist effectively enough with the human eye.

I never know if anything is warped unless i stick the head on the roraty bed and run a DTI over it, even then a flat edge doesnt mean its a true edge.

And there is no point cleaning chambers and valves if your not going to do it properly, you can almost do as much damage with a metal file and a lathe than good....it'll be back there in seconds anyway.

If you gonna scrate the crap out of anything, do the exhaust ports, but leave the valves alone and be careful of the seats.
huwwatkins
Site Subscriber

Joined: 10 Jun 2004
Posts: 2317

Posted: Sat Mar 19, 2005 5:00 pm

OK, so maybe a metal saw aint the most precise intrument in the world, but its all i've got access to Crying or Very sad , you reckon i should leave it as is or just get it skimmed anyway? (although i'd rather not if i dont have to Razz)
Doc
Site Subscriber

Joined: 11 Feb 2005
Posts: 2929

Posted: Sun Mar 20, 2005 6:21 am

I was reading the haynes manual last night and it said in there that only the C type engines were able to be skimmed???

Chris, what do you think??
Chris H
Forum Moderator

Joined: 02 Mar 2004
Posts: 19978

Posted: Mon Mar 21, 2005 1:17 am

you can skim anything, wether or not its a clever idea or not is another matter.

Skimming bumps up the CR and knocked the timing out slightly, but as long as its just a skim not 5mm or something it'll be fine.

i have seen them all, skimmed up to the manifold studs and so on.
BenR
Level 5 User

Joined: 18 Jun 2004
Posts: 114

Posted: Mon Mar 21, 2005 5:03 am

I've just skimmed a megan head 40 thou to drop the CC volume back down to 42.5cc from 48.

It'll put everything out, but its nothing that i cant solve
JB
Mr Quoter-vator

Joined: 16 Feb 2004
Posts: 7405

Posted: Mon Mar 21, 2005 5:21 am

well seein as ur sellin it huw, just slap it back together...
stan
Gay Rights Activist

Joined: 07 Apr 2004
Posts: 1268

Posted: Mon Mar 21, 2005 7:12 am

BenR wrote:
I've just skimmed a megan head 40 thou to drop the CC volume back down to 42.5cc from 48.

It'll put everything out, but its nothing that i cant solve


I was going to skim mine by around a mil aswell, but decided against it for now. would take CR to around 10.6-7 ish , but ive got a valve/piston clearance of 2.5mm with the larger inlet valves. would probably be ok, but not going to risk it
Display posts from previous:      


 Jump to:   




SPIDER ARCHIVE
Powered by phpBB © 2001, 2002 phpBB Group :: FI Theme :: All times are GMT - 7 Hours