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Online Paul2bikes

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Coolant issues
« on: 19 March, 2019, 09:48:00 AM »
Been reading a thread on the Tiger 800 forum about a boy who started with a "Low oil pressure light" on a fairly low mileage bike. He went thro' all the obvious before stripping the motor to replace all the bearings.

He's put it all down to mixing coolants/wrong coolant causing acidic deterioration of his head gasket.
A huge job resulting from a simple error if his theory is correct, he's not back on the road yet, so dunno if he's cured it.
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Offline indytiger1050

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Re: Coolant issues
« Reply #1 on: 19 March, 2019, 10:45:03 PM »
 :005:

Something doesn't sound right, low oil pressure = coolant.   :164:

SO he had loads of oil in the coolant.  :112:
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Online Yellow Dog

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Re: Coolant issues
« Reply #2 on: 19 March, 2019, 11:38:42 PM »
Have heard of this before. The mixture causes an reaction with the alloy head and corrodes from the inside, hence the weaker pressure.

Whilst it was kept out of the news, as much as was possible, BMW cars suffered with this issue, in the early 2000s.
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Offline indytiger1050

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Re: Coolant issues
« Reply #3 on: 21 March, 2019, 06:20:50 PM »
*Originally Posted by Yellow Dog [+]
Have heard of this before. The mixture causes an reaction with the alloy head and corrodes from the inside, hence the weaker pressure.

Whilst it was kept out of the news, as much as was possible, BMW cars suffered with this issue, in the early 2000s.

OK,, I'm not slow, just not fast..

I have coolant that corrodes what, OIL passages? 

Corrosion of the coolant passages I could believe but that would cause lower coolant pressures not oil.   Or what I'm I missing.
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Online Yellow Dog

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Re: Coolant issues
« Reply #4 on: 21 March, 2019, 07:50:30 PM »
*Originally Posted by indytiger1050 [+]
OK,, I'm not slow, just not fast..

I have coolant that corrodes what, OIL passages? 

Corrosion of the coolant passages I could believe but that would cause lower coolant pressures not oil.   Or what I'm I missing.

Actually, I am a bit (a lot) slow  :033: The issue I was thinking of was the unleaded fuel problem, that screwed with the chemical composition of BMW cylinder heads, causing the alloy to fail.

The coolant can only mess with where it actually goes, which is not anywhere near the head gasket.

Perhaps coolant was accidentally poured into the oil filler  :008:
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Online Paul2bikes

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Re: Coolant issues
« Reply #5 on: 21 March, 2019, 08:08:45 PM »
Well, the boy reckons the mixed or wrong coolant attacked the head gasket, that then allowed water to mix with the oil which then caused premature wear of the bearings causing his low oil pressure light to come on. He's put a lot of work into this, I hope it works for him.

Have a read if you like, but it's a long one.
https://www.tiger800.co.uk/index.php/topic,23906.200.html
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Offline Sidewinder

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Re: Coolant issues
« Reply #6 on: 22 March, 2019, 12:21:12 PM »
Both coolant & oil flow via the head gasket, if this fails it can allow the two to mix.  If you get crossover between high pressure oil runs and coolant runs you get oil in coolant, if you get crossover between oil return runs and coolant runs you get coolant in the oil.

*Originally Posted by Yellow Dog [+]
The coolant can only mess with where it actually goes, which is not anywhere near the head gasket.
« Last Edit: 22 March, 2019, 12:27:05 PM by Sidewinder »

Offline Paullie

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Re: Coolant issues
« Reply #7 on: 22 March, 2019, 12:38:44 PM »
*Originally Posted by Sidewinder [+]
Both coolant & oil flow via the head gasket, if this fails it can allow the two to mix.  If you get crossover between high pressure oil runs and coolant runs you get oil in coolant, if you get crossover between oil return runs and coolant runs you get coolant in the oil.
Interesting!  :460:

Offline Sidewinder

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Re: Coolant issues
« Reply #8 on: 22 March, 2019, 01:32:50 PM »
Further, the wrong coolant, incorrectly diluted coolant or two different types of coolant mixed, can cause corrosion/pitting of the head or damage to the gasket.  Either of which can allow one of the three elements kept separate by the gasket - oil/coolant/combustion products to cross contaminate.

I don't think there are any hi pressure oil feeds going via the head gasket as the feed to the head is via that external pipe which feeds to the cams.  The oil does drain back to the sump through it though I think.
« Last Edit: 22 March, 2019, 01:52:25 PM by Sidewinder »

Online Yellow Dog

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Re: Coolant issues
« Reply #9 on: 22 March, 2019, 09:41:15 PM »
Never mind all that: Did the water pump survive it all  :008:
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