Car Forums  

Go Back   Car Forums > Technical Discussions > Repairs & Maintenance
FAQ Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-26-2005, 05:42 PM   #1
rage141414
CF Newbie
 
Join Date: Feb 2005
Posts: 4
1970 novs ss overheating

i have been having problem after problem with my nova it has a 355 all aftermarket engine. just had the heads rebuilt and all gaskets replaces, still has a few leaks but nothing to awful. i am having a problem with overheating and have tried a few things the first time i started it after all the gaskets were replaced the intake gasket wasnt sealed right and was bubbling out coolant so i replaced it thinking it would fix it but it didnt. i also noticed the brakes seem to start holding when it warms up but that probly just because of the heat problem. the car can sit in the parking lot and idle all day and work just fine but if i let it get to the temp is supposed to be at and take a small lap it jumps to 200 when i stop it cools down. anyone have any ideas, the timing is a bit off starts good but when i turn it off warmed up it tries to roll over a few more times it was off a bit before the rebuild also but never oberheated like this.

Last edited by rage141414 : 02-26-2005 at 05:45 PM.
rage141414 is offline   Reply With Quote
Old 02-26-2005, 10:55 PM   #2
Carcass
CF Newbie
 
Join Date: Feb 2005
Posts: 72
Quote:
Originally Posted by rage141414
i have been having problem after problem with my nova it has a 355 all aftermarket engine. just had the heads rebuilt and all gaskets replaces, still has a few leaks but nothing to awful. i am having a problem with overheating and have tried a few things the first time i started it after all the gaskets were replaced the intake gasket wasnt sealed right and was bubbling out coolant so i replaced it thinking it would fix it but it didnt. i also noticed the brakes seem to start holding when it warms up but that probly just because of the heat problem. the car can sit in the parking lot and idle all day and work just fine but if i let it get to the temp is supposed to be at and take a small lap it jumps to 200 when i stop it cools down. anyone have any ideas, the timing is a bit off starts good but when i turn it off warmed up it tries to roll over a few more times it was off a bit before the rebuild also but never oberheated like this.


Uh, I think u shouldn't mess around with it anymore. You're obviously not good enuff and ur messing it up. Heed my advice, take it to a shop and have them re-fix everything you've fixed, you'll thank me later when ur engine actually lasts.
__________________
Because I don't Say it....Don't mean I ain't thinking it...
Carcass is offline   Reply With Quote
Old 02-27-2005, 12:57 AM   #3
rage141414
CF Newbie
 
Join Date: Feb 2005
Posts: 4
thanx

it has been mostly done by a mechanic or overwatched by one, i only did the gasket part, i like to see what the problem is before i take it to a mechanic so i dont get taken to the cleaners.
rage141414 is offline   Reply With Quote
Old 02-27-2005, 05:04 AM   #4
jeepmaniii
CF Newbie
 
Join Date: Feb 2005
Location: phx, az.
Posts: 14
Talking maybe maybe not

This sounds kind of obvious; but sometimes the obvious is easily overlooked.
How long was it sitting before or during the rebuild? Have you checked the thermostat? I own a "73" and although it wasn't sitting I hadn't cleaned out the coolant system for a while and it was having the same issues. It turned out the thermostat was rusted shut or open or whatever. Anyway I swapped it out and my problem was solved. Hope I helped. Good luck if I didn't.

Take care of that girl. If you don't you will regret it. Somebody tried to steal mine and I caught them but to do it I had to spin it out with my Jeep. I ended up smashing the rear quarter panel (no creases) and totaled the drivers door. Now I am debating selling her.

Jeepmaniii
__________________
jeepmaniii
jeepmaniii is offline   Reply With Quote
Old 02-27-2005, 07:21 AM   #5
srober32
CF Addict
 
srober32's Avatar
 
Join Date: Feb 2005
Location: Detroit, Michigan
Posts: 442
Either the thermostat, the radiator or the water pump... check the therm and then flush the rad and then do a pressure test.
srober32 is offline   Reply With Quote
Old 03-02-2005, 09:55 PM   #6
carls47807
CF Freak
 
Join Date: Mar 2005
Location: new york
Posts: 582
water pump

make sure the dope at the parts shop didn't sell you a reverse rotation water pump, or make sure you screwy drive belts aren't running it backwards.
carls47807 is offline   Reply With Quote
Old 03-03-2005, 05:56 PM   #7
oldtimebuilder
CF Newbie
 
Join Date: Mar 2005
Posts: 3
question

you didn't mention what original engine the BossaNova had.

If it had a six, change the 2 row Rad core for a 4 row core.

Aslo be very sure the thermostat isn't in upside down. it will run cool at idle do to the bypass feature, but it will heat very quickly....

Reading through you email I noticed the engine is "dieseling" This is either heat related or timing related. Have you put a light on it to check the timing?
Usually the timing is too high.

I couldn't really get if it has had the problem all along or if it just started.

Hope this helps.

Last edited by oldtimebuilder : 03-03-2005 at 06:01 PM.
oldtimebuilder is offline   Reply With Quote
Old 03-09-2005, 02:54 PM   #8
mcapony
CF Newbie
 
Join Date: Mar 2005
Location: PA
Posts: 1
If it has a clutch fan check the clutch mechanism.
mcapony is offline   Reply With Quote
Old 03-28-2005, 01:16 PM   #9
the lobster
CF Addict
 
Join Date: Mar 2005
Posts: 263
timing

i saw a 6 cylinder bmw that had the timing off enough that the exhaust manifold was glowing cherry red at night.if your timing is out enough that your valves are hot enough to burn fuel after you shut it off,the timing is way off. put a bigger fan,water pump,radiator,something obvious here.personally i would put in a solid state ignition if you do not already have it .
the lobster is offline   Reply With Quote
Old 03-29-2005, 02:44 AM   #10
BanffAutoSpa_ap
Pants The Ripper
 
BanffAutoSpa_ap's Avatar
 
Join Date: Jan 2005
Location: Southern Alberta Likes:Long walks on the beach.....after anal
Posts: 1,510
Quote:
Originally Posted by rage141414
i have been having problem after problem with my nova it has a 355 all aftermarket engine. just had the heads rebuilt and all gaskets replaces, still has a few leaks but nothing to awful. i am having a problem with overheating and have tried a few things the first time i started it after all the gaskets were replaced the intake gasket wasnt sealed right and was bubbling out coolant so i replaced it thinking it would fix it but it didnt. i also noticed the brakes seem to start holding when it warms up but that probly just because of the heat problem. the car can sit in the parking lot and idle all day and work just fine but if i let it get to the temp is supposed to be at and take a small lap it jumps to 200 when i stop it cools down. anyone have any ideas, the timing is a bit off starts good but when i turn it off warmed up it tries to roll over a few more times it was off a bit before the rebuild also but never oberheated like this.

still leaks a little? why?...there are 4 main reasons for overheating

- Insufficient Air Flow
- Insufficient Coolant Flow
- Coolant Leaks
- Insufficient Cooling Capacity

so... start there, and if timing is retarded this produces higher cylinder temperatures, resulting in increased heat removal requirements.

id say fix the leaks first, seems too obvious eh?
__________________
Despite the high cost of living, it remains very popular.
BanffAutoSpa_ap is offline   Reply With Quote
Old 03-29-2005, 03:21 AM   #11
srober32
CF Addict
 
srober32's Avatar
 
Join Date: Feb 2005
Location: Detroit, Michigan
Posts: 442
If the temp goes up to 200 and not above, I wouldn't worry too much about that but I agree with Banff, fix the leaks and adjust the timing to specs. Imagine if you will, a young man with a sweet ass ride, a '70 Nova let's say, says "yeah, she's got a newly rebuilt 355 witha 750 double pumper and dualies." His buddy says "cool, pop the hood!" He does and here is this gleaming, shiny, fluid covered motor. Then he has to find a new friend 'cause the old one thinks he's a liar. May not happen but a leaking engine does not look good or run good.
__________________
When replacing your altenator, make sure your battery is fully charged.

Last edited by srober32 : 03-29-2005 at 03:27 AM.
srober32 is offline   Reply With Quote
Old 03-29-2005, 03:24 AM   #12
srober32
CF Addict
 
srober32's Avatar
 
Join Date: Feb 2005
Location: Detroit, Michigan
Posts: 442
As for the brakes, if you have four wheel drums or just drums in the rear they are probably over tightened and as they heat up they tend to grab and lock up more. If you cannot pull the drums off (assuming they are drums and they do not have a rust ridge) fairly easily, they are over tight.
__________________
When replacing your altenator, make sure your battery is fully charged.
srober32 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Forum Jump



All times are GMT +1. The time now is 04:08 AM.

Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2002 - 2011 Car Forums. All rights reserved.