Carby clean should just melt it off, but a small scraper like a putty knife will help move the bulk of it off, if theres any left.
But scrape it, don't use the corner and scratch it off that may leave little grooves.
Carby clean should just melt it off, but a small scraper like a putty knife will help move the bulk of it off, if theres any left.
But scrape it, don't use the corner and scratch it off that may leave little grooves.
A marriage licence should be like your fishing licence!
Expires every year and you get a 3 day pass when you go interstate.
thnaks
Let us know how you get on. Pictures would be good before and after.
A marriage licence should be like your fishing licence!
Expires every year and you get a 3 day pass when you go interstate.
if you take your head to an engine reconditioner they can do the head and you will be assured of a flat finish. the work can be easily done with out taking to much off as when the head is milled the increments are in thousandths of an inch. did this as an appprentice (motor vehicles) many moons ago.
as was already said do not have too much taken off as this can raise the compression ratio (if there is a combustion chamber in the head) which might sound good and give better performance but it puts extra strain on the big end bearings of the con rod that are probably old and tired and these bearings will thenfail.
Thanks Yakka.
You are correct.
I don't really have time or $$ to take my whole head and take to a Pro - would be nice.
Maybe in 7 more years...
Guts.
Unfortunately no pics.
But you should have seen the salt build up - CRIKEY!
It woudl have been good to take pics ofthis but too keen to get it clean - looked like hell had frozen over...
I just want people to know that I woudl never let a motor get to this stage..
People in this forum know very well I am very particular and keen.
I tell you what though - I am glad I did nottake this to a dealer.
It is taking forever.!
SO far 8 hours from beginning of first nut undone to one head being put back on with new gaskets. etc..
Now - for the other head...
Sounds great smelly, nothing like doing it your self, have a few tinnies makes it more fun.
Carby clean work okay for the carbon build up.
A marriage licence should be like your fishing licence!
Expires every year and you get a 3 day pass when you go interstate.
You are correct in essence, but outboard mechanics do not typically utilise machine shops for head surfacing.Originally Posted by yakka
if you take your head to an engine reconditioner they can do the head and you will be assured of a flat finish. the work can be easily done with out taking to much off as when the head is milled the increments are in thousandths of an inch. did this as an appprentice (motor vehicles) many moons ago.
as was already said do not have too much taken off as this can raise the compression ratio (if there is a combustion chamber in the head) which might sound good and give better performance but it puts extra strain on the big end bearings of the con rod that are probably old and tired and these bearings will then
You are correct in essence, but outboard mechanics do not typically utilise machine shops for head surfacing.[quote author=yakka link=1165571523/15#18 date=1165615753]if you take your head to an engine reconditioner they can do the head and you will be assured of a flat finish. the work can be easily done with out taking to much off as when the head is milled the increments are in thousandths of an inch. did this as an appprentice (motor vehicles) many moons ago.
as was already said do not have too much taken off as this can raise the compression ratio (if there is a combustion chamber in the head) which might sound good and give better performance but it puts extra strain on the big end bearings of the con rod that are probably old and tired and these bearings will then
[/quote]
Not quite understanding you BM, if a head is "resurfaced" it needs to be machined, never seen an outboard repair shop with head resurfacing machines, so if they dont have a machine and dont take it to any one, its not called a resurface, it can only be claimed to have the old gasket removed and cleaned
cheers
blaze
Outboard mechanics do not typically resurface heads via a machine shop.
It is done (as prior stated) with the use of a large, thick plate of glass, or a thick flat piece of timber.
Emery cloth taped to it and work the head back and forth till all areas are bright and shiny.
Thats head resurfacing for outboards.
Machine shops are generally a no go for outboard head resurfacing but of course are utilised for block maching etc
Hi Nick
I know the system well having been in the trade for a number of years, If someone was quoting me a resurfacing of a head on an invoice and I ever found out it had been done like that I would be livid, not saying it may not be ample to clean up an "old 2 stroke" thats all it is, its not a resurface. Just hope they dont carry that practice over to the newer technolies with there much finer tolerence.
cheers
blaze
So how do you guy's go about the wet and dry clean up of the head surface.
What grade paper ? and what motion, figure 8 pattern, or up and down, or circular.
I like a 800-1000 grit with a figure 8 patern.
A marriage licence should be like your fishing licence!
Expires every year and you get a 3 day pass when you go interstate.
Blaze, no other mechanics I know charge for head resurfacing. Its just a part of reassembly...
Roughasguts,
I use a sheet of 120 grit emery (so its dry paper) and any motion as long as the end result is a flat head.
Cheers
Yakka,
Hardened needle roller bearings do not get "old and tired" as you suggested.
Automotive mechanicals has some major differences to marine mechanicals.
Cheers
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