We have had this beautiful 1990 300SEL for over eight years now
and for driving comfort and luxury, we could not ask for more.
So we were driving to the airport to catch an overseas flight and
less than a mile away, I noticed the temperature needle all the way at
120 deg. I wanted to stop right away but decided (bad call!!) to keep
going to try to get to the airport. We managed to get to the parking
lot and the poor car finally quit dead.
On our return a week later, I filled the radiator with coolant and
water and left the radiator cap open, then cranked it. The car started
but water was gushing out the top of the tank. White smoke seemed to
come out of the exhaust. The car groaned and managed to move for a
hundred yards and then quit. Could not restart it, so had it towed
home. When I try to start now, the engine cranks, but no start. I now
found out that the top radiator hose was cracked at the joint, probably
causing all the fluid to escape.
My question is, what does it look like, a cracked head or blown
head gasket or worse? The car has over 220K miles. If I try to sell it
as is, I am not sure what I would get in its present condition. Other
than this, the car is in good shape, some minor issues but no major
problems. We live in Tampa, Florida. What am I looking at for repair
costs? Any help will be much appreciated.
Tiger - 25 May 2006 16:45 GMT
At this point, you got blown head gasket... possibly warped head. You need
to look at oil... if sign of coolant there, then it is gone.
At this point, you are better off getting a good engine out of a part car,
but the catch is this... is the price of the used engine equal to buying a
similar car? If yes, then just buy a similar car.
T.G. Lambach - 25 May 2006 21:34 GMT
Remove the spark plugs and crank the motor for 5 seconds. Stand back as
coolant may be forcefully expelled. Then you'll know which cylinders are
likely involved (also from their wet spark plugs).
A compression test might tell you a bit more but removing the cylinder
head is the only definitive way to know gasket vs. head or both.
If the motor ran well and didn't burn oil its worth fixing, otherwise
consider a rebuilt engine - not cheap but cheaper than another car.
zoher - 26 May 2006 23:49 GMT
Thank you for your replies. I looked at the oil from the dipstick and
it seems normal. I also removed the spark plugs, cranked for 5 secs and
liquid spurted out. Looked like a mixture of oil and water. BTW, there
was no coolant as I had to refill the radiator and I just put in water.
If it is just a blown gasket, should the car at least start? What does
water spurting out mean? I have been told it will cost ~$1500. if it is
a cracked head, and ~$1000. just for a blown head gasket.
Tiger - 27 May 2006 14:35 GMT
I don't know if Ivo Kucera is still in business... honest to earth guy who
knows MB, BMW, and Porsche
Euto Car Repair.
6201 78th Ave N.
Pinella Park, FL.
813-541-7410
I know the area code is wrong... so find the area code of Clearwater/Pinella
Park side and you should be able to call.
T.G. Lambach - 27 May 2006 18:09 GMT
1. If it is just a blown gasket, should the car at least start?
2. What does water spurting out mean?
1. The motor should start but will not run long before boiling over from combustion gas entering the cooling system - the head gasket is blown - remember?
2. Water spurting out of the spark plug cavities confirms that coolant has entered those cylinders, either from a blown head gasket and / or cracked cylinder head.
IMHO $1,000 to replace a head gasket is fair if the surfaces are dressed so they are flat (no longer warped) and the shop stands behind the job with a warranty.
Cheaper than buying another car and inheriting a new set of unknown problems.
Richard Sexton - 29 May 2006 20:18 GMT
>Thank you for your replies. I looked at the oil from the dipstick and
>it seems normal. I also removed the spark plugs, cranked for 5 secs and
[quoted text clipped - 4 lines]
>water spurting out mean? I have been told it will cost ~$1500. if it is
>a cracked head, and ~$1000. just for a blown head gasket.
If the head's not cracked then it's warped. The head *might* be alright but
I'd really doubt it.

Signature
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net
Richard Sexton - 29 May 2006 20:15 GMT
> We have had this beautiful 1990 300SEL for over eight years now
>and for driving comfort and luxury, we could not ask for more.
[quoted text clipped - 20 lines]
>problems. We live in Tampa, Florida. What am I looking at for repair
>costs? Any help will be much appreciated.
If the interior is grey then the cars a write off and I'll give you $100
for the interior.
Otherwise budget 500 for a head, $500 to take it off and another $500 to
put it all back together. $500 ought to be the price of a good used head
or having yours rebuilt. There's probably abother several hundred dollars in
parts, fiddly bits, lotions and potions.
If it were me I'd find a rusty car with a really good motor and just
swap them myself. It's pretty straightforward. You might be able to do it
for half the above figure on a good day.

Signature
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net