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sean
Member
Date registered: Dec 2015
Location: austin texas United States
Vehicle(s): 88 300gd 460 swb right hand 85 280ge 617a turbo di
Posts: 48
| 300sd in my gwagon overheat head gasket leak questions
Hi friends
Here I am in Central Texas it's 100 degrees everyday Drive the G in the middle of the day and it's hovering at 100 degrees Celsius or 212 Fahrenheit shut it off and it climbs to another 30 degrees replaced all of the injectors recently number two hole had rust in it I was suspect head gasket leak has been my opinion used some of that bars leak head gasket stuff praying for a miracle for 11 bucks.
still hot hovers at 100 c and gets hotter on hills and I don't like it. So I'm contemplating doing the head gasket work myself does everyone recommend that I get new valve guides and have the head completely redone or just have the Machine Shop look at it and make the call on whether I need to do it or not or is it just advisable to say have it done thanks guys |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: 300sd in my gwagon overheat head gasket leak questions
Check the operation of all the cooling system parts. Pay particular attention to the fan clutch. You should hear a very pronounced roar from the fan when the engine gets hot and you rev it. If not, there is your first fix. You do have a fan shroud, right?
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sean
Member
Date registered: Dec 2015
Location: austin texas United States
Vehicle(s): 88 300gd 460 swb right hand 85 280ge 617a turbo di
Posts: 48
| RE: 300sd in my gwagon overheat head gasket leak questions
Thanks alan.
Changed the water pump, flushed the system 50 50 water glycol. Fan clutch is working.
While I had the injectors out for the nozzle swap I did a compression check front cylinder 380 second cylinder 270 3rd cylinder 350 four cylinder 375 5th cylinder 5 400 PSI cold motor.
The G starts instantly runs flawlessly no smoke no staggers smooth idle. I am somewhat apprehensive about breaking into it I do have a head gasket and the stretch bolts that came with the G when I bought it.
I'm wondering if my other option isn't just wait two months for it to cool off again and then I can drive it all year when it's cool.
I'm reading that the head gasket is pretty finicky about reinstallation should I be real concerned about that or should I just go for it it is a big job but I have the tools and the ability. My other direction is to buy another motor for $400 and swap it out that I'm more confident with because I'm not into the particulars of the fine Swiss watch of a motor that this thing is thanks for the help gentleman. |
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Boy G
Expert
Date registered: Feb 2007
Location: Bushveld, South Africa
Vehicle(s): Diesel G's: 617A and 602
Posts: 1683
| Re: 300sd in my gwagon overheat head gasket leak questions
You do not mention guage calibration.
I would not pull anything off it until I had made sure that it was indeed running hot. The Sd engine sender unit ( and there are three iirc) might not be calibrated to the g temp guage. Mine was not.
You say your visco is ok, it should roar if it gets to about 95 c. Does it? |
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sean
Member
Date registered: Dec 2015
Location: austin texas United States
Vehicle(s): 88 300gd 460 swb right hand 85 280ge 617a turbo di
Posts: 48
| Re: 300sd in my gwagon overheat head gasket leak questions
Hi Andrew
I have an aftermarket temp guage can't confirm if accurate but will soon.
I have to admit I do not hear a Roar from the fan but from my investigation if there's resistance to spinning when it's not running it's good. am I wrong about that?also saw a YouTube video where a guy shoves crumpled up newspaper into the fan while it's running and if it doesn't stop it's good. anyone know how to test fan clutch? I'm not ruling anything out at this point when I saw a slightly Rusty injector I was suspect of exhaust gases shoving into the water jacket and not allowing that cylinder to cool off which just happens to be right beside where the temperature sending unit is number,2 cylinder
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| Re: 300sd in my gwagon overheat head gasket leak questions
If there's exhaust gas getting into the coolant, shops can detect it with a "sniffer" made for just this purpose. There are also home shop mechanic tools available, but this shouldn't be something you need to do a lot. I'd look around for a shop that can diagnose a head gasket leak. I wouldn't tear down an otherwise good-running and good-measuring engine for a bit of rust on an injector tip. But I could be wrong.
It will be easy to hear the fan clutch kick in and the fan suddenly pick up and run when the engine gets up to temp if the clutch is working correctly. How the fan feels when it's cold has nothing to do with whether the clutch valve (activated by bimetallic strip on front of clutch) is shifting the valve pin properly at the correct temperature.
I'm just back from 3 days in San Antonio this past weekend so I know your pain! 
Dave G. |
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bluegg
Veteran
Date registered: Nov 2016
Location: Oro-Medonte, Ontario, Canada
Vehicle(s): 1985 300GDT, 2003 Beetle 1.8t S, 1982 F350 SC Dual
Posts: 141
| Re: 300sd in my gwagon overheat head gasket leak questions
Sean.
I picked up a 280GE 1985 with a transplanted 617A.
I had terrible overheat problems. After chasing down everything I could think of I read about a big batch of bad thermostats that came into NA and were installed in a ton of sedans.
My 617A came from one of those.
When I inspected the thermostat it looked brand new so I carried on.
After reading this info I went back to the thermostat, removed and boil tested. It didn't budge.
I bought as new stat, threw it in and no more heat problems at all.
Simpler stuff can sometimes really complicate a situation. |
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sean
Member
Date registered: Dec 2015
Location: austin texas United States
Vehicle(s): 88 300gd 460 swb right hand 85 280ge 617a turbo di
Posts: 48
| Re: 300sd in my gwagon overheat head gasket leak questions
Thanks for all the input guys .
Installed a new thermostat couple weeks ago no change even drilled several holes in the thermostat as per diesel Giant website may change that during the winter but when it's hot I think all the water i can get through there is better , warm up time is minimal when it's 100 degrees outside Fahrenheit.
I agree with checking and trying Simple Things First have ordered a new fan clutch and a 9 blade fan not sure if it's going to fit or not but still trying the easy stuff.
I am in Houston currently found a 85 300sd for $700 owner did a compression check all cylinders above 450 practically spotless of oil . oil cap barely dances when engine is running I'm covering my bases for 700 bucks if nothing else I have spare radiator battery alternator tires the list goes on May swap it out . but I'm probably going to continue swatting at the original problem thanks so much for the help gentleman keep it coming with more ideas it's most appreciated I love my G and was considering a metric motor what do you guys think of that for 9 Grand
Ouch |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: 300sd in my gwagon overheat head gasket leak questions
You have verified that the gauge is reading correctly, right?
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sean
Member
Date registered: Dec 2015
Location: austin texas United States
Vehicle(s): 88 300gd 460 swb right hand 85 280ge 617a turbo di
Posts: 48
| Re: 300sd in my gwagon overheat head gasket leak questions
I have not verified the gauge is working correctly it's an aftermarket but I must say I have some faith in it I have recently replaced the fan clutch and went to a 9 blade fan. I am amazed I can get to 210 degrees it comes back to 195 it will run up to 200 if on a hill but I consider it a vastly better situation it will touch to 210 but always comes back off I'm considering it a win |
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sean
Member
Date registered: Dec 2015
Location: austin texas United States
Vehicle(s): 88 300gd 460 swb right hand 85 280ge 617a turbo di
Posts: 48
| Re: 300sd in my gwagon overheat head gasket leak questions
I'm sitting at the lake with the air conditioner on and I would say 195 at idle is a win every anybody else think that's too hot or not I'd like to hear what you think thank you way better than what it was I would be buried at 2:10 right now and as soon as I started to drive it would get to 2:30 Fahrenheit |
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Boy G
Expert
Date registered: Feb 2007
Location: Bushveld, South Africa
Vehicle(s): Diesel G's: 617A and 602
Posts: 1683
| Re: 300sd in my gwagon overheat head gasket leak questions
"Calibration," shouted the brethren, but Sean ignored them!
Just pulling your leg. Glad you are happy.
Edit: just googled 195 in your measure. I live in a hot climate also and would say my 617A peaks at that measure. I am currently fitting an AC so perhaps that will account for some increase also.
Edited by Boy G 7/28/2017 3:29 AM
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Inkblotz
Expert
Date registered: Apr 2006
Location: Georgia
Vehicle(s): 90 300GD "Thundering Turtle II", w/ 603A turbo
Posts: 3185
| RE: 300sd in my gwagon overheat head gasket leak questions
As mentioned above purchase from NAPA their block tester. This helped me determine if my head gasket was leaking.
https://www.napaonline.com/en/p/BK_7001006
Was the thermostat a BEHR? NEVER put any other thermostat in that engine except for a BEHR.
Mark
Edited by Inkblotz 7/29/2017 8:15 AM
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