block corrosion

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block corrosion

Postby h-bot » Mon Jan 06, 2003 9:55 am

From: tobsb2002_REMOVE_988210_THIS_@yahoo.com

Hello everyone;
With all the talk about block corrosion from lack of cooling system
maintenence, my question is; is there a way to fix it if it's not too
extensive? Can you heli-arc some material onto the cylinder when
rebuilding?
Thaks - Terry




[This is message #10166 by user tobsb2002 on Yahoo! Group Cosworth Vegas: http://groups.yahoo.com/group/cosworthvegas ]
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block corrosion

Postby h-bot » Mon Jan 06, 2003 11:15 am

From: cswrth1_REMOVE_985784_THIS_@yahoo.com

The easiest way would probably be to sleeve the block. The places
that I have seen the corrosion on the cars that I have looked at is,
around the top of the free standing cylinder bores, the water pump,
the bottom of the head, and the thermostat housing cover. The head
can be resurfaced if it has not gotten too deep and I haven't seen
many that bad. I have seen water pumps and the thermostat housing
cover that had holes all the way through them but those can be
replaced. The blocks that I have seen damaged have always had the
majority of the corrosion at the top of the cylinder walls near where
the head gasket seals. I have seen some that needed to be sleeved
but I have never seen one that was so bad that re-sleeving wouldn't
fix the problem. It's just a lot of time money and work. As for
heliarching, to try and build up the material there would probably
distort the cylinder walls quite a bit and I would not reccomend it.
Chris




[This is message #10167 by user cswrth1 on Yahoo! Group Cosworth Vegas: http://groups.yahoo.com/group/cosworthvegas ]
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block corrosion

Postby h-bot » Tue Jan 07, 2003 1:34 pm

From: bobc997615_REMOVE_181321_THIS_@yahoo.com

--- In <a href="/group/cosworthvegas/post?protectID=219233066105193209050199029077192253163098100009128121188190230091025019053061151110147">cosworthvegas@yahoogroups.com</a>, tobsb2002 <<a href="/group/cosworthvegas/post?protectID=091233212180056219138097203245129208071">no_reply@y...</a>> wrote:
> Hello everyone;
> With all the talk about block corrosion from lack of cooling
system
> maintenence, my question is; is there a way to fix it if it's not
too
> extensive? Can you heli-arc some material onto the cylinder when
> rebuilding?
> Thaks - Terry

I wouldn't put much effort into trying to weld the block especially
at the bore deck face. It can be done but the block being a die
casting, there is entrapped air/porosity the aluminum that would make
welding sometimes difficult to say the least. There may be oxides in
the micro pores that would cause some problems with metal flow
or "blow-outs" as welder call it. In the early '80s, we produced the
Oldsmobile diesel intake manifold that was a three piece welded
affair and heli-arcing these die cast pieces together was a small
nightmare with inconsistent welds (and that was with 380 alloy, not
high silicon 390 alloy).


bob chin
2172, 2987




[This is message #10168 by user bobc997615 on Yahoo! Group Cosworth Vegas: http://groups.yahoo.com/group/cosworthvegas ]
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block corrosion

Postby h-bot » Tue Jan 07, 2003 1:55 pm

From: doctorduke_REMOVE_916234_THIS_@yahoo.com

Sleeving with the thick flange sleeves that replace the whole top of
the bore with a cast iron flange is the proper repair.

Sleeving is the best way to renew the bore anyway, but I've seen CVs
with over 100K miles on them that don't have any taper at the top of
the bore.

A lot of high mileage CV engines can be brought back to near new
condition and performance with just a cylinder head refresh as the
guides don't last much beyond 50K miles and the OEM valve seals are a
poor design and can be replaced with modern "positive" type valve
seals to drastically reduce oil consumption.

Duke




[This is message #10169 by user doctorduke on Yahoo! Group Cosworth Vegas: http://groups.yahoo.com/group/cosworthvegas ]
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