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Location:
Brisbane
Registered:
July 2003
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Pitted block surface
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Tue, 02 December 2003 08:35
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The mechanic pulled the head of the Soarer today, yep, blown head gasket but it's also got a pitted block around the pistons...
What can I do? Any advice?
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Location:
Brisbane
Registered:
October 2002
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Re: Pitted block surface
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Tue, 02 December 2003 08:41
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pitted in the bore or on the deck, the deck will always look pitted when u pull the head off, FULLY clean the deck {use an air whizzer} and it should be fine, bores: re-bore, new pistons, new rings $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Pitted block surface
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Tue, 02 December 2003 11:36
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Pics please.....depending on location and size you may have to deck the block.....grief.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Pitted block surface
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Tue, 02 December 2003 11:50
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| philmelvin wrote on Tue, 02 December 2003 19:41 |
the deck will always look pitted when u pull the head off, FULLY clean the deck {use an air whizzer} and it should be fine
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whoa... BIG assumption
like GT said, pics, as well as straight gauge measurements would be good to know.
7m's have a habbit of having bad deck surfaces...
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Location:
Brisbane
Registered:
July 2003
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Re: Pitted block surface
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Tue, 02 December 2003 11:56
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I don't know if I could get pics, I haven't even seen it myself.
Just going by what the mechanic has said.
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Location:
Brisbane
Registered:
October 2002
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Re: Pitted block surface
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Tue, 02 December 2003 12:00
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| ed_ma61 wrote on Tue, 02 December 2003 21:50 |
| philmelvin wrote on Tue, 02 December 2003 19:41 |
the deck will always look pitted when u pull the head off, FULLY clean the deck {use an air whizzer} and it should be fine
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whoa... BIG assumption
like GT said, pics, as well as straight gauge measurements would be good to know.
7m's have a habbit of having bad deck surfaces...
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oh, i didnt know that 7m's had that issue as well, i just thought it was a head design issue 
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Pitted block surface
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Tue, 02 December 2003 12:19
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dont know if its really 7m specific, or just a trait of 15 year old block castings combined with a long I6 block type...
also chuck in poor coolant maintenance
just as an anecdote, i know 7m blocks to wander, and badly corrode around water channels.
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Location:
Brisbane
Registered:
July 2003
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Re: Pitted block surface
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Tue, 02 December 2003 22:46
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Mechanic says it's corroded around the water channels and around the piston holes.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: Pitted block surface
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Tue, 02 December 2003 22:48
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water channels - it happens. as long as it's not too severe, not much to worry about.
piston bores is much more of a worry... an expensive worry
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Location:
Brisbane
Registered:
July 2003
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Re: Pitted block surface
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Tue, 02 December 2003 22:49
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It's about 5mm away from the actual hole.
Keep in mind I have a HKS metal head gasket and ARP bolts waiting to go in.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Pitted block surface
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Wed, 03 December 2003 01:01
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deck it
pita, but worth the hassle
deck it
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Location:
Brisbane
Registered:
July 2003
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Re: Pitted block surface
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Wed, 03 December 2003 01:04
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$$???
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Pitted block surface
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Wed, 03 December 2003 01:09
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actual machining, $80
getting the guy to pull the block out.... 
(herin lies the joy of doing things yourself)
is definitely worth asking him.
and ask youself, how much are you spending so far, and do you want to compromise that expense by not spending a bit more 
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: Pitted block surface
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Wed, 03 December 2003 01:10
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*perves on ed's sexy new avatar*
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Location:
Brisbane
Registered:
July 2003
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Re: Pitted block surface
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Wed, 03 December 2003 01:19
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So far $280 for head gasket,
$200 for ARP bolts.
Approxx $400 for labour.
$100 for head to be machined.
Does the engine have to be dismantled for the block to be decked??
The engine has only got 100,000 k's on it, and apart from a BHG causing corrosion of the surface, it's really good.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Pitted block surface
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Wed, 03 December 2003 01:25
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| ViNcEnXo wrote on Wed, 03 December 2003 12:19 |
Does the engine have to be dismantled for the block to be decked??
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Yes.
| ViNcEnXo wrote on Wed, 03 December 2003 12:19 |
The engine has only got 100,000 k's on it, and apart from a BHG causing corrosion of the surface, it's really good.
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Therein lies the problem. If the pitting is bad or badly placed, it's actually a fucked motor.
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Location:
Brisbane
Registered:
July 2003
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Re: Pitted block surface
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Wed, 03 December 2003 01:33
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Hmm, mechanic is going to have his engine reco-er look at it.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Pitted block surface
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Wed, 03 December 2003 03:45
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Certainly get someone well versed at these things to look at it - the surfaces have to be pretty good to tolerate a MHG. You may wish to use the standard head gasket and run standard boost - this should be a bit more forgiving of suspect surfaces.
However: Don't trust any of us - we haven't seen it nor are we in the business of rebuilding engines.
It's not the end of the world if you choose to deck it - it will give you an opportunity to freshen it up a bit with new rings and bearings if you so desire.
If your ultimate plan was to do some sort of conversion, then you may wish to do the sums on patch up repair and replace versus a proper repair job.
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Location:
Brisbane
Registered:
July 2003
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Location:
Brisbane
Registered:
October 2002
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Re: Pitted block surface
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Wed, 03 December 2003 07:14
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the waer channels look fine TO ME, but that "dent" {corrosion} looks bad
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Location:
Brisbane
Registered:
July 2003
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Re: Pitted block surface
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Wed, 03 December 2003 08:58
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Going to get the block decked. Not going to do it poorly. I've bought the best parts possible so far, I am not going to stop now.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Pitted block surface
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Wed, 03 December 2003 09:35
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the corrosion around the water channels isnt great... but is FAR from the worst ive seen, and on those two shots, isnt approaching the cyl bore in any serious way. still, they could definietly benefit from a shave...
the ring around the comb chamber is FAR more concerning as this is the EXACT location of the fire ring of the head gasket - ie where the gasket seals. id be wanting to machine it so the was zero evidence of that ring depression left...
you may encounter some increase in compression with this though, and your cam timing may be out.
if you can tell me how much gets taken off the head and block in total (exactly), i can advise you how to set up your cam gears to compensate.
i doubt the compression increase will be a serious issue. if you have concerns though, i can show you some spots to relive the comb chambers... 
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Location:
Brisbane
Registered:
February 2003
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Re: Pitted block surface
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Wed, 03 December 2003 10:14
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Ed: if you heavily machined the block to removed the dents from the gasket rings, would you get too close to pistons hitting valves? even with modified timing on the cams
i know i'm displaying complete lack of knowledge of 7M's here but am just curious...
charles.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Pitted block surface
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Wed, 03 December 2003 11:00
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| thechuckster wrote on Wed, 03 December 2003 21:14 |
Ed: if you heavily machined the block to removed the dents from the gasket rings, would you get too close to pistons hitting valves? even with modified timing on the cams
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not a chance - you can land a boeing in the space between the valves and pistons of a 7m 
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Location:
Adelaide
Registered:
December 2002
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Re: Pitted block surface
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Thu, 04 December 2003 11:37
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thats looks mighty good compared to what i found on my GE, although this is the head.
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