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Author Topic: Rover HG - is it HG?  (Read 24865 times)

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JamesV6CDX

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Re: Rover HG - is it HG?
« Reply #180 on: 21 January 2007, 18:34:53 »
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After a short spin today, the coolant turned quite dark...

Presumably, this is just the crap that is left in it when HG went?

I have dropped the coolant out again, and refilled again with Vx's finest.

Still seeing droplets of oil in header tank, presumably again residue from the original failure?

This is all totally normal after a HGF...

Just do regular coolant/oil changes for a bit, it could take ages and ages to be squeaky clean again...
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Re: Rover HG - is it HG?
« Reply #181 on: 21 January 2007, 18:38:11 »
One odd thing, its defo missing under load when not warmed up.

Not sure if this is the air intake leak, or perhaps duff coil pack/HT lead?
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JamesV6CDX

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Re: Rover HG - is it HG?
« Reply #182 on: 21 January 2007, 18:44:58 »
A slight amount of air leaking in would cause it to idle high, but wouldn't think it would cause it to misfire only when cold. I'd put money on that dodgey coil pack
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Re: Rover HG - is it HG?
« Reply #183 on: 21 January 2007, 21:11:42 »
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A slight amount of air leaking in would cause it to idle high, but wouldn't think it would cause it to misfire only when cold. I'd put money on that dodgey coil pack
My thoughts as well.

After doing a bit of research on why K series HG fail, the misfire/power lack she had and the HG failure may be 2 different issues, with one causing the other...
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JamesV6CDX

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Re: Rover HG - is it HG?
« Reply #184 on: 21 January 2007, 21:18:51 »
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Quote
A slight amount of air leaking in would cause it to idle high, but wouldn't think it would cause it to misfire only when cold. I'd put money on that dodgey coil pack
My thoughts as well.

After doing a bit of research on why K series HG fail, the misfire/power lack she had and the HG failure may be 2 different issues, with one causing the other...

I thought from the beginning it was just two seperate issues, but I never thought one would be the cause of the other. What's the logic behind that?
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Re: Rover HG - is it HG?
« Reply #185 on: 21 January 2007, 21:22:31 »
It turns out I have a K series expert (from design point of view) in the family...



Would the misfire cause the temp to increase slightly?
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Re: Rover HG - is it HG?
« Reply #186 on: 21 January 2007, 21:23:47 »
I really can't answer that, but I wouldn't have thought so, I would have thought the temp problems were caused by the shagged HG, which is now changed?
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Re: Rover HG - is it HG?
« Reply #187 on: 21 January 2007, 21:25:32 »
Thats a bit scary, a duff plug/lead can cause a head gasket fail? Makes me glad I didn't buy a rover.
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Re: Rover HG - is it HG?
« Reply #188 on: 21 January 2007, 21:31:44 »
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Thats a bit scary, a duff plug/lead can cause a head gasket fail? Makes me glad I didn't buy a rover.
Apparently a problem with many all alloy engines, esp earlier ones - the HG will fail if temp fluctuates slightly higher than normal...
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JamesV6CDX

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Re: Rover HG - is it HG?
« Reply #189 on: 21 January 2007, 21:33:29 »
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Thats a bit scary, a duff plug/lead can cause a head gasket fail? Makes me glad I didn't buy a rover.
Apparently a problem with many all alloy engines, esp earlier ones - the HG will fail if temp fluctuates slightly higher than normal...

That is pretty worrying.... it should have at least some tolerance, to get a bit warm and be OK before failing..
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Re: Rover HG - is it HG?
« Reply #190 on: 21 January 2007, 21:38:39 »
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Thats a bit scary, a duff plug/lead can cause a head gasket fail? Makes me glad I didn't buy a rover.
Apparently a problem with many all alloy engines, esp earlier ones - the HG will fail if temp fluctuates slightly higher than normal...

That is pretty worrying.... it should have at least some tolerance, to get a bit warm and be OK before failing..
Gotta own up and not fully understand it all, esp when he started going on about LM10 and LM15 type metals, but the gist is there is so very little tolerance in the system (due to insufficient cooling capacity as buyers want instant warm up). Something happens at a few hundred degrees where this alloys meet (block to head), and as the combustion may be in the 1000s degrees, it is reliant on the cooling capacity.  So any cooling glitch, be it stat, poor coolant, fans etc etc can cause the issue...
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Re: Rover HG - is it HG?
« Reply #191 on: 21 January 2007, 21:40:10 »
And K series is particularly bad as when it was designed, it was leading edge - one of the first of the modern all alloy engines, lean running for economy (hence hotter), low coolant capacity....
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Markie

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Re: Rover HG - is it HG?
« Reply #192 on: 21 January 2007, 21:47:27 »
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Thats a bit scary, a duff plug/lead can cause a head gasket fail? Makes me glad I didn't buy a rover.
Apparently a problem with many all alloy engines, esp earlier ones - the HG will fail if temp fluctuates slightly higher than normal...

Correct!!  :y The alu heads warp at the sign of sunshine.

So yes duff lead can cause it. Normally though, and i know this doesnt apply to you Jamie, its poor servicing or lack of regular coolant changes that cause it ( less effective coolant, slightly higher temp BLAM)

Bad original gasket design also to blame.

Reckon your lead or just the bad desgned gasket is your cause Jamie.
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Re: Rover HG - is it HG?
« Reply #193 on: 21 January 2007, 21:53:58 »
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Quote
Quote
Thats a bit scary, a duff plug/lead can cause a head gasket fail? Makes me glad I didn't buy a rover.
Apparently a problem with many all alloy engines, esp earlier ones - the HG will fail if temp fluctuates slightly higher than normal...

Correct!!  :y The alu heads warp at the sign of sunshine.

So yes duff lead can cause it. Normally though, and i know this doesnt apply to you Jamie, its poor servicing or lack of regular coolant changes that cause it ( less effective coolant, slightly higher temp BLAM)

Bad original gasket design also to blame.

Reckon your lead or just the bad desgned gasket is your cause Jamie.
My original gasket (as seen in the pics in this thread) looks the same as the replacement - a metal gasket with red silicone seals...

The coolant in that car got changed annually once I stopped dealer servicing on it (came with 3 or 4 yrs free servicing), having read somewhere that poor coolant can cause it.  Last summer was first time I used Vx Red though (it had always had blue in before).

Though I guess 70k on original gasket was not bad, and if this one lasts 70k I will be very, very happy...
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Markie

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Re: Rover HG - is it HG?
« Reply #194 on: 21 January 2007, 21:56:14 »
Its not bad  :y

I had one go on 2000miles !
I had one go on 44k
And i had one that was fine on 70k untill barsteward stole it.
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