924Board.org

[B]

Hey everyone,

I had a question about temperature rise in our cars. I have the '79 na with the bae turbo installed. Things seemed to be running ok with the newly installed 931 wur. I had to change my timing belt and alternator belt and I rotated the distributor so that the canister was more on top and easier to reach.

All of the timing marks lined up nicely and I thought I was well on my way. When starting the car the next time, I noticed it started but not as quickly as it had before. I also noticed an immense amount of heat coming from the exhaust manifold - noticeably more than usual. (to give you an idea as I was checking and re-checking my timing, my timing light clamp for plug #1 began to melt.). I re-checked timing to make sure it was not too far advanced and it seemed ok still.

I also thought with a new heater valve to go ahead and flush the system and refresh the antifreeze, thermostat and rad cap. I used a meat thermometer in the bleed hole to check when the fans were coming on, around 160*.

When I took the car for a drive, the water temp hit 160 within the first 5 min then 180+ by the first 10. I re-bled the system further. Again with in the first 5 min. 160*+ 10 -15 180* (I should add this is with a temp gauge that I added a few years ago to help gauge better how hot I was getting.) The temp gauge on the dash has not gone above the second white line. The exhaust does not seem as hot as it was before, but still seems hotter than before I started all of this.

Any thoughts on why the excessive heat or rapid heat up? would be extremely appreciated

Sorry for such a long post and question - this has been an unexpectedly long process

thanks
Sean
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1979 924 n/a
BAE turbo
5-speed snailshell

[B]

also - I did spin the turbo by hand and it seemed to move ok - no hanging up or real resistance

I guess my one concern is am I over -thinking or over reacting? or is there a larger problem lurking?
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1979 924 n/a
BAE turbo
5-speed snailshell

[RC]

Sounds like you may actually have the ign timing too retarded. This causes a slow late burn extending into your manifold. Just as bad as too much advance, nearly.

Also its warm (by aussie standards) ATM in many parts of US? Will cause temp rise by same degree as above "normal" ambient.
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World`s quickest 924 2L slushbox

[daniel]

Check that the fan/alt belt is good an tight, also make sure that the radiator is also getting hot. Do a compression check to test for head gasket failure and as RC says, make sure timing is spot on
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet

[B]

thank you both very much

I will re-check the timing - I was concerned about too advanced.

The temps are supposed to be down a bit this week as well mid 80's vs last weeks 90-100.

I will re-check belts and radiator as well, I have not seen any smoke from he car, so I had not considered the head gasket yet, but I do not know if that is the only visual indicator -

thanks again - the help is greatly appreciated

Sean
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1979 924 n/a
BAE turbo
5-speed snailshell

[ptheskil]

+1 on the timing retarded. Classic symptoms.
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1981 931 series2 Euro spec

[B]

2 questions -

how far advanced should I set the timing? (currently about 2 teeth to the left of the white dot on the cam)

would a blown head gasket be visible any other way besides the usual losing coolant or white sweet smelling smoke?

belts seem tight enough, no strange popping out of the exhaust

could the distributor be off by a tooth or 2 ? maybe it needs pulled and reset?

(ok maybe 4 questions)

thanks again
Sean
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1979 924 n/a
BAE turbo
5-speed snailshell

[fiat22turbo]

Set the timing on the cam straight up. Line it up at TDC properly.

You advance the timing by turning the distributor on the housing.

When you moved it, you upset the relationship between the cam and the distributor. (BTW, the wrong distributor housing location can cause the cap/wires to hit the hood and cause some issues)

Set the timing back using the factory settings and start from there.

Since you're running a turbo you might use the 931 specifications.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[B]

thanks everyone

I reset the timing and on a whim checked some of the nuts on the exhaust manifold - one top at the rear was not as tight as it could be

tightened that fired it up and let it run in the garage for 20 minutes
the temp gauge never went above 170 and the dash gauge barely reached the first white line and the radiator seemed to have an even heating over the entire surface

I did get a little nervous at first because of the smoke at start up that lasted for a minute or 2 but it did go away - the car has been sitting for about a week

Do these numbers sound a little better?

I know the heat off of the back of the motor was not nearly as hot and not nearly as fast to heat up as before

as always your help is extremely appreciated

Sean
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1979 924 n/a
BAE turbo
5-speed snailshell