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Author Topic:   Help!!. Need Advice
Limited Mod 57
Dirt Forum Racer

Total posts: 86
posted August 12, 2005 09:24 AM  
The continuing sage...

As stated in an earlier post,while sitting in the staging area, the temps were getting up to around 200, 210 (during the race, it didn’t seem to change much either way, i.e. lower or higher). And after its initial race, once I was back at the shop, took the radiator cap off and it took almost 2 gallons of water to fill the car back up.

Also, while sitting on the track during a "Red" in the Feature, the car just died while idling and had to be pushed back to the pits. However, it did start up again later and a couple of other times we've started it and it sounded fine.

Anyway, I thought maybe, as was suggested by others, that the rad cap was bad, so I replaced it.

While topping off the raditator last night, noticed the water was off-color. Unfortunately it looks like they are bigger problems than just a defective radiator cap. Oil in the water (or is that water in the oil?).

(Related note: Earlier in the week, I had drained 2 cups of oil into a measuring cup to see if the oil looked murky or chocolate milk like. It looked fine, but I guess I didn't properly account for water/oil seperation)

So what should I suspect? I know this is usually a result of cracked heads or cylinder or cylinders, but how does one determine which it is? or could it be something as simple as a blown head gasket?

Appreciate any help y’all

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[This message has been edited by Limited Mod 57 (edited August 12, 2005).]

b4racing
Dirt Forum Champ
Total posts: 626
posted August 12, 2005 11:11 AM  
look at your spark plugs. Do a compression test If still in dought let it run some and then take the spark plugs out and see if it is blown out.

leapinlizard
Dirt Freak

Total posts: 402
posted August 12, 2005 01:07 PM  
Pressurize the cooling system. Listen for escaping air through the plug holes or valve cover. Run a leakdown test and a compression test gives a good indication.

Limited Mod 57
Dirt Forum Racer

Total posts: 86
posted August 15, 2005 01:48 PM  
Compression test values on all 8 were within 10#s (maybe even within 5#s) of each other

Believe I found the problem though. When I took the intake off, could see a water trail around the front bolt hole on the driver side.

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Limited Mod 57
Dirt Forum Racer

Total posts: 86
posted August 31, 2005 12:24 PM  
quote:
Originally posted by leapinlizard:
Pressurize the cooling system. Listen for escaping air through the plug holes or valve cover. Run a leakdown test and a compression test gives a good indication.

Would like some more details on what you're talking about.

I'm thinking about applying pressure to the coolant system (cap off the water inlet at the water pump, cap off the outlet at the water neck with a PSI gauge. The pumping some compressed air into the water system).

Assuming it leaks (pressure drops), where do I start looking for the leak?

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[This message has been edited by Limited Mod 57 (edited August 31, 2005).]

[This message has been edited by Limited Mod 57 (edited August 31, 2005).]

leapinlizard
Dirt Freak

Total posts: 402
posted August 31, 2005 01:09 PM  
You looking for obvious water leaks on the floor but your also listening for air escaping. Pull the plugs and see if water comes out of any cylinder, listen for water or escaping air into the crank case. listen at the carb throat with hit wide open. listen to the exhaust pipes. Pull the pan drain plug and see if water comes out there. Don't pressurize over 20 pounds. It might collapse the rad fins. Leave a constant pressure on the system for a least 30 min. you shouldn't have anymore than a few pounds drop after the 30 min interval.

Limited Mod 57
Dirt Forum Racer

Total posts: 86
posted August 31, 2005 01:23 PM  
Thanks Mr. Lizard (didn't feel I knew you well enought to call you by your first name )

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Did forget to add. The original problem due to a cracekd intake (cracked between the front 2 bolt holes on the driver's side). Add this repared and rechecked the clearances. Found that the surfaces between the heads and intake weren't parrallel, so I had the intake machined.

I don't believe they had been properly checked before and when the intake was toruqued down, it cracked the intake.

[This message has been edited by Limited Mod 57 (edited August 31, 2005).]

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