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Injectors for '81 380SL

  
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Chip

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Since: Oct 11, 2007
Posts: 16



(Msg. 1) Posted: Mon Jun 02, 2008 5:43 pm
Post subject: Injectors for '81 380SL Get Alert
Archived from groups: alt>auto>mercedes (more info?)
My long time mechanic tells me that I have a wide open #6 injector which
is causing my rough running and lots of gas smelling blue smoke. He
doesn't do them but recommended another shop to either replace or
rebuild. He couldn't provide me with a solid quote but maybe around $1000.

Please oh mighty knowledgeable list, what is a good $ estimate for
1)rebuilding and 2)replacing? With 118K on the clock, and 80psi
compression on #6, should I do just the one or all of them? The car is
in great shape otherwise. Rebuild or replace? Is this a doable repair
for a shade tree mechanic? What other things for them to look for while
they are in there?

Thanks, any info is accepted.

Chip

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mobi

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Since: May 15, 2007
Posts: 6



(Msg. 2) Posted: Tue Jun 03, 2008 6:23 am
Post subject: Re: Injectors for '81 380SL Get Alert [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Jun 2, 9:43 pm, Chip <chip.w....DeleteThis@ieee.org> wrote:
> My long time mechanic tells me that I have a wide open #6 injector which
> is causing my rough running and lots of gas smelling blue smoke. He
> doesn't do them but recommended another shop to either replace or
> rebuild. He couldn't provide me with a solid quote but maybe around $1000.
>
> Please oh mighty knowledgeable list, what is a good $ estimate for
> 1)rebuilding and 2)replacing? With 118K on the clock, and 80psi
> compression on #6, should I do just the one or all of them? The car is
> in great shape otherwise. Rebuild or replace? Is this a doable repair
> for a shade tree mechanic? What other things for them to look for while
> they are in there?
>
> Thanks, any info is accepted.
>
> Chip

Roland is correct, but wait: 1k to replace one fuel injector? Buy a
new set at autohausaz, for instance, it costs 20 bucks each + U$ 5.0
insulators and seals made by Bosch, it's a DIY job and takes 1/2 hour
to get it done.
HTH,

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Roland Franzius

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Since: Dec 03, 2003
Posts: 97



(Msg. 3) Posted: Tue Jun 03, 2008 9:01 am
Post subject: Re: Injectors for '81 380SL Get Alert [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Chip schrieb:
> My long time mechanic tells me that I have a wide open #6 injector which
> is causing my rough running and lots of gas smelling blue smoke. He
> doesn't do them but recommended another shop to either replace or
> rebuild. He couldn't provide me with a solid quote but maybe around $1000.
>
> Please oh mighty knowledgeable list, what is a good $ estimate for
> 1)rebuilding and 2)replacing? With 118K on the clock, and 80psi
> compression on #6, should I do just the one or all of them? The car is
> in great shape otherwise. Rebuild or replace? Is this a doable repair
> for a shade tree mechanic? What other things for them to look for while
> they are in there?
>
> Thanks, any info is accepted.

Blue smoke is oil. Fuel rich smoke would be black. Let an MB engine
specialist have a look at the problem.

--

Roland Franzius
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"-->> T.G. Lambach

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Since: Jan 21, 2007
Posts: 280



(Msg. 4) Posted: Tue Jun 03, 2008 9:04 am
Post subject: Re: Injectors for '81 380SL Get Alert [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
The good news is that the offender is known, #6. I'd replace only that
one and see if the problem is cured - it most likely will be. The #6
spark plug must be fouled and also ought to be at least cleaned if not
replaced. The low compression in #6 is troublesome - probably worn rings
from no oil on the cylinder walls due to too much gas flooding the cylinder.

Do an internet search there are numerous companies that clean and
calibrate gas fuel injectors for about $20 each but know that not every
injector is rebuildable, some are too far gone and must be replaced.

Suggest you go to www.autohausaz.com and see what injector they can sell
you. Good company.
--

© 2008 T.G.Lambach. Publication in any form requires prior written
permission.
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Tiger1

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Since: Jan 07, 2004
Posts: 952



(Msg. 5) Posted: Tue Jun 03, 2008 3:45 pm
Post subject: Re: Injectors for '81 380SL Get Alert [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
380 engine use fuel distributor... there is no individual electronic fuel
injector... but rather like ignition system... use a distributor. When these
fuel distributor go bad, one or two cylinders may get no fuel or too much
fuel as in a massive leak.

The only way to fix this is rebuilt fuel distributor that will cost about
$450... or you can get them used. Considering how old these cars are... it
is a gamble. Like this:

http://cgi.ebay.com/ebaymotors/Mercedes-Benz-107-126-8-cyl-Bosch-Fuel-...tributo

Now, as for you #6 cylinder. that is bad, you need 100PSI in order to burn
fuel properly and pass inspection. You can determine what is the problem by
using compressed air. Most compression tester has a detachable hose and that
hose can connect to compressed air hose.

You have to set your engine to a certain degree as marked on the timing
(harmonic balancer) so that both valves are closed for that cylinder. Pump
air in and listen/feel where the air is leaking out from.

Intake horn = intake valve is burnt
Exhaust = exhaust valve is burnt
Oil cap = rings

You can also remove the valve cover and see that both the valves are not
engaged. It is best to turn it over by hand with all spark plugs removed.
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