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Author Topic: 1.6 i.e. exhaust manifold heat sheild?  (Read 513 times)
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flatfourontour
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« on: 25 April, 2022, 08:25:07 AM »

My Prisma overheated at the mot station.

The exhaust manifold is right in front of the radiator.

I went round with thermometer and everything is good, 82 degrees C top hose, 50 degrees lower hose....except section of rad in front of the manifold...120degrees.

Should there be a heat shield on these cars?...my car has no shield.

Thanks!
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lancialulu
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« Reply #1 on: 25 April, 2022, 10:03:23 AM »

EPER does not show a  heat shield and my 1600ie does not have one. I did fit the optional wider radiator though and have no problems in the heat of south of France albeit the electric fan is keen to cut in when idling or arriving home from a run out. Cant blame the radiator.....
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia 1600HF
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
flatfourontour
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« Reply #2 on: 25 April, 2022, 02:01:56 PM »

EPER does not show a  heat shield and my 1600ie does not have one. I did fit the optional wider radiator though and have no problems in the heat of south of France albeit the electric fan is keen to cut in when idling or arriving home from a run out. Cant blame the radiator.....

OK, thank you, that is very helpful.

Somehow the mot station had it idling and revving for 35 mins. They were trying to get it through emissions. HCs and CO were both fine, way under the pass limit.

However apparently there is a "smoke test" which the analyser either passes or fails. News to me as I thought it was a visual test, and the exhaust gases are as clean as a whistle...no sign of smoke.

If it never had a manifold heat shield, is it worth trying to wrap in heat tape? As I said, never any problems in normal driving, but there is the heat sink from the exhaust onto the section of radiator directly in front. The fan sits to the left side, so the right hand side of the radiator has no fan and sits directly in front of the exhaust...hence it gets hot there. Radiator and water pump are both quite new.

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fay66
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« Reply #3 on: 25 April, 2022, 05:10:09 PM »

Always used to take my Dedras for a good thrash to get it nice and hot, and when it went in it always passed all the emission tests, much better than letting it stand  heating up.
Brian. 8227 Cool
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
2006 Renault Megane 1 5 Dci Sports Tourer
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A1.6HPE
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« Reply #4 on: 25 April, 2022, 09:00:45 PM »

I have owned two Prisma Symbols (1600ie) and a Delta GTie. None of them had a shield for the exhaust manifold. I don't recall one on my HFie either.
The radiator fan not cutting in is more likely to be the problem caused by corroded earth wiring below the headlight.

Leo
« Last Edit: 28 April, 2022, 11:32:46 AM by A1.6HPE » Logged

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flatfourontour
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« Reply #5 on: 25 April, 2022, 09:03:25 PM »

Always used to take my Dedras for a good thrash to get it nice and hot, and when it went in it always passed all the emission tests, much better than letting it stand  heating up.
Brian. 8227 Cool

Thank you Brian. Yes today I took it 6500 revs up the bypass and back. No problem today with emissions lol. Must remember that next year.
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flatfourontour
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« Reply #6 on: 25 April, 2022, 09:09:05 PM »

I have owned two Prisama Symbols (1600ie) and a Delta GTie. None of them had a shield for the exhaust manifold. I don't recall one on my HFie either.
The radiator fan not cutting in is more likely to be the problem caused by corroded earth wiring below the headlight.

Leo


Yeah, fan cuts in, everything is good. I fitted some of that corrugated aluminium ducting over the exhaust manifold today. The portion of radiator in front now only reaches 105 degrees now, rather than 120 degrees. However, I think the problem only happened because they kept it ticking over and then revving up, then ticking over for 35 mins.  I took it for a blast round the bypass today, and it passed emissions no problem after that.
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fay66
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« Reply #7 on: 26 April, 2022, 07:16:39 AM »

Always used to take my Dedras for a good thrash to get it nice and hot, and when it went in it always passed all the emission tests, much better than letting it stand  heating up.
Brian. 8227 Cool

Thank you Brian. Yes today I took it 6500 revs up the bypass and back. No problem today with emissions lol. Must remember that next year.
👍
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
2006 Renault Megane 1 5 Dci Sports Tourer
Dedra Technical Adviser
A1.6HPE
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Posts: 109



« Reply #8 on: 28 April, 2022, 11:36:57 AM »


Quote

Yeah, fan cuts in, everything is good. I fitted some of that corrugated aluminium ducting over the exhaust manifold today. The portion of radiator in front now only reaches 105 degrees now, rather than 120 degrees. However, I think the problem only happened because they kept it ticking over and then revving up, then ticking over for 35 mins.  I took it for a blast round the bypass today, and it passed emissions no problem after that.


At one MOT session for my Montecarlo, they left the engine running for quite a while (I think the emissions test specifies that they wait until the rad fan cuts in).  I had just topped up the header tank so it was brim-full and overflowed into the pit - LOL.

Leo
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