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Subject: Re: [MBZ] head gasket OM 617
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1985 300TD has high pressure in the radiator tank even when cold. Runs low on
coolant, but only about twice a year, no visible leak. Mileage has decreased
from 26 - 21mpg, no detectable loss of power. Performed coolant chemical test
for leak, which was negative.
Is this the head gasket?
I doubt you have any head/gasket problems. If you did you would be
going thru coolant more often than that. As far as the mileage goes,
there are many other things that would cause a drop in mileage before a
head gasket would. If you still want a head I have them available.
Karl Wittnebel
Karl Wittnebel wrote:
1985 300TD has high pressure in the radiator tank even when cold. Runs low on coolant, but only about twice a year, no visible leak. Mileage has decreased from 26 - 21mpg, no detectable loss of power. Performed coolant chemical test for leak, which was negative.
Is
Marshall, what's the impact of timing chain stretch on fuel economy?
1983 300TD
On 3/9/06, John Berryman [EMAIL PROTECTED] wrote:
On Mar 9, 2006, at 1:03 AM, Karl Wittnebel wrote:
Is this the head gasket? If so, anyone have a rebuilt head they'd
like to get rid of? Not in a big rush
andrew strasfogel wrote:
Marshall, what's the impact of timing chain stretch on fuel economy?
Chain stretch is directly related to injection pump timing, and pump timing is
directly related to fuel economy.
Someone will correct me if I'm wrong, but I think every degree of chain stretch
is
1/2 degree = h.m. mpg?
On 3/9/06, John Ervine [EMAIL PROTECTED] wrote:
andrew strasfogel wrote:
Marshall, what's the impact of timing chain stretch on fuel economy?
Chain stretch is directly related to injection pump timing, and pump
timing is
directly related to fuel economy.
Someone
andrew strasfogel wrote:
Marshall, what's the impact of timing chain stretch on fuel economy?
With modest stretch (even past the 5 or so degree limit) fuel economy
seldom deteriorates much. With extensive stretching, fuel consumption
can increase more. Anything that requires more fuel to
andrew strasfogel wrote:
1/2 degree = h.m. mpg?
Not linear. Never tried to accurately measure it. Have changed chain and
mpg improved by 5+% but the numbers I've seen are ALL over the place.
Too many variables. I have moved the actual pump timing of a well
running engine by almost 4 degrees
