John Deere 8R experts needed, coolant pressure problem ?

SteveO

Member
Hi,

I have a problem with JD 8360R, it got 1,25 Bar pressure in the expansion bowl and it blowed cooland out.
We thought it was head gasket and we replaced it, machines the head, new bolts and all and today same f..king thing !

What could push the pressure in cooling system ? Head was checked and it looks good, no cracks or anything.
No water in oil and no oil in water.

Where does the cooling system meet pressure so it can boost in the system ?

Thanks a lot
 

Phil P

Member
Arable Farmer
Location
North West
Does it build pressure at idle or only under load?
Possibly egr cooler if only under under load (boost), cracked liner of at idle but usually see coolant in the oil with a cracked liner and cylinder can hydraulic.
 

SteveO

Member
No just in the field, at home at full throttle all ok, it can get to 85° max, when it pulls 5m disc harrow and temperature goes to 95° then it blows, after like 10-20 min of work.

DPF and EGR are deleted, DPF pipe replaced and EGR plate installed. Shpuld I unplug EGR then maybe ?
In EGR cooler everything was dry, also no smoke of any kind from the exhaust.

How it can be egr cooler ? Is it plugged on exhaust part (plate is installed) or antifreeze line inside the cooler ?
 

Phil P

Member
Arable Farmer
Location
North West
No just in the field, at home at full throttle all ok, it can get to 85° max, when it pulls 5m disc harrow and temperature goes to 95° then it blows, after like 10-20 min of work.

DPF and EGR are deleted. In EGR cooler was all dry, also no smoke of any kimd from the exhaust.

How it can be egr cooler ? Is it plugged on exhaust part (plate is installed) or antifreeze line inside the cooler ?
Egr cooler has coolant flowing through. Is it blanked off at exhaust and inlet manifold side? Will get pressure from bother sides. Has egr valve been removed?
 

SteveO

Member
I think it was blanked with a plate right next to EGR, 4 screws, I think it is before EGR cooler. Coolant part is of course not blanked, cooler is still mounted.
EGR is not removed, I can just unplug the plug from it but it should make no difference if it is blanked ?

Before I changed the gasked blank plate was not installed and I got same problem so it is not blank plate fault.
 

Phil P

Member
Arable Farmer
Location
North West
I think it was blanked with a plate right next to EGR, 4 screws, I think it is before EGR cooler. Coolant part is of course not blanked, cooler is still mounted.
EGR is not removed, I can just unplug the plug from it but it should make no difference if it is blanked ?

Before I changed the gasked blank plate was not installed and I got same problem so it is not blank plate fault.
As long as the cooler is blank both ends it won’t be that. But could be getting some pressure coming back though the egr valve though if not blanked at that end even if it’s not opening. There’s not really anything else other than head and liners after that, don’t think the turbos are water cooled on them?
 

SteveO

Member
You mean exaust pressure inside EGR cooler boost coolant pressure ? But then I should have coolant leak in the EGR cooler ? It should be impossible even with 1 blank plate. It cannot pass any pressure even if the EGR is opening.
I dont see how it can be that ?
 

Timbo

Member
Location
Gods County
Egr cooler needs to be blanked both ends- thats to say exhaust manifold end and intake manifold end. Ideally blank coolant lines and remove the cooler itself entirely.
 

Phil P

Member
Arable Farmer
Location
North West
Really ? What is causing this ?
The coolers can split internally then either exhaust or boost pressure is forced into the coolant system. It use to be a really common issue when 30 series first came out.
If egr is deactivated remove the cooler to be sure out of the system or blank BOTH ends.
 

SteveO

Member
Egr coolers and valves can be deleted, why only JD eats head gaskets like hamburgers, I havent heard about other tractors doing that so often.
 

daveydiesel1

Member
Livestock Farmer
Location
Co antrim
Is turbo not cooled by coolant? Iirc a 7r series had this but could be wrong? Have a relative who told me his buggered up and ended up way coolant in the cylinder iirc
 

Could a ‘Meat Tax’ be on the cards in the UK?

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Written by Richard Halleron from Agriland

The latest machination coming from the so-called ‘opinion formers’, who seem to have the ear of government advisors in London, is the introduction of a ‘Meat Tax’ at consumer level.

This approach, it is argued, would have the combined impact of reducing meat consumption levels (I can really see the health benefits coming through now), while also helping to reduce the overall carbon footprint of production agriculture.

What absolute drivel! In my opinion, none of this makes sense at any level. This is a scurrilous and unfounded attack on livestock farming in this part of the world.

Yet, it has to be taken seriously. I make this point because economists at Rothamsted Research have already crunched the numbers where the introduction of a ‘UK...
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