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 7Likes
04-04-2022, 05:57 PM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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Not Ranked
Coolant smell
Often after driving my Cobra, I smell coolant, but never see leak signs nor drips on the ground underneath. All hose fittings are tight and appear dry. I have an overflow tank with an outlet hose, but never see any dripping or signs of coolant discharge. The last few oil analyses have indicated a slight amount of coolant in the oil. Recently checked coolant level and it was down about a quart since changed about a year and half and 500-600 miles ago. Engine is a 351W. Where should I be looking to figure this out? |
04-04-2022, 06:50 PM
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Senior Club Cobra Member
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Join Date: Jul 2000
Location: Chilliwack,BC,
BC
Cobra Make, Engine: F5 Roadster
Posts: 1,415
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intake
Hi,
Check the intake manifold bolts, they loosen up and should be re torqued, if left too long the gasket may need to be changed.
Perry 
__________________
F5 cobra Mark 4 roadster, Ruby Wine Red with pearl,
dual 2" roll bars, warmed up 302, E Street aluminum Heads, Comp cam and roller rockers, AOD, 4.10 Eaton Possi, Power Baer/disc brakes, block hugger headers, 2 1/2" under car exhaust, F500 18" black spoke wheels.
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04-04-2022, 07:14 PM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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Thanks for that suggestion. Any idea of torque specs for manifold bolts?
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04-04-2022, 07:19 PM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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Found the bolt torque specs online. 23-25 lbs.
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04-04-2022, 07:47 PM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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Just checked manifold bolts. 10 of 12 accessible without removing fuel rail. All 10 turned a good half a turn or so with torque wrench set at 22lbs. Hope that will make a difference.
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04-05-2022, 08:04 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
And before you start yanking the intake and heads off, give the old cooling system tablets a try. They really do work... sometimes.  But they're a lot easier than yanking the heads off.
https://www.amazon.com/Genuine-GM-12.../dp/B000QIH3C4
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04-05-2022, 08:07 AM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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Thanks Patrick.
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04-05-2022, 08:21 AM
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CC Member
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Join Date: Jan 2018
Location: Lafayette,
IN
Cobra Make, Engine: Looking to buy
Posts: 1,295
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Also could be a leaking head gasket.
__________________
 Cobra loving, autocrossing Grandpa Architect.
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04-05-2022, 08:45 AM
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CC Member
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Join Date: Feb 2018
Location: Lodi,
CA
Cobra Make, Engine: 427 manowar forged crank roller rockers . BIG CAM.
Posts: 784
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Not Ranked
Never use a band-aid fix, always fix it right, unless you are just trying to make it home ,so you can fix it right. You could cause more problems, by adding things in your coolant that don"t belong in it.
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04-05-2022, 08:48 AM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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Not Ranked
I'm hoping tightening the intake manifold bolts will do the job. I guess I'll know after next drive.
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04-06-2022, 08:08 PM
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CC Member
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Join Date: May 2010
Location: Saint Augustine,
FL
Cobra Make, Engine: Backdraft Lingenfelter LS-7
Posts: 6
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Hope to hear if intake bolts fixed your issue. Seems you would have had a sweet smell in the exhaust or making oil if that was the case.. |
04-07-2022, 06:24 AM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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I'll drive it this weekend and report back.
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04-07-2022, 10:13 AM
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CC Member
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Cobra Make, Engine:
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Quote:
Originally Posted by w-lewis
Just checked manifold bolts. 10 of 12 accessible without removing fuel rail. All 10 turned a good half a turn or so with torque wrench set at 22lbs. Hope that will make a difference.
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The final 180 degrees of rotation up to torque spec makes a HUGE difference.
Those bolts were likely only at 50% of clamping force specification. You may
want to rethink doing the last (2) bolts as well if those (10) were that loose.
Last edited by Unique427; 04-07-2022 at 10:17 AM..
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04-07-2022, 01:32 PM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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Good thought. I'll look at it closer to see what all is involved in removing fuel rail.
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04-07-2022, 01:34 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by w-lewis
Good thought. I'll look at it closer to see what all is involved in removing fuel rail.
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On a lot of intakes, you have to use a crow foot to get to a couple of them. Before taking apart the rail, see if you think that would do it first. |
04-07-2022, 01:37 PM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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I'm afraid removing the fuel rail will be more complicated than I want to get into, but will look at it. Pardon my ignorance, but what is a crow foot?
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04-07-2022, 01:40 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by w-lewis
I'm afraid removing the fuel rail will be more complicated than I want to get into, but will look at it. Pardon my ignorance, but what is a crow foot?
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It lets you put your ratchet down on it with the head of the wrench off to the side. (that's really a terrible explanation). Here's a pic:
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04-07-2022, 01:42 PM
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CC Member
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Join Date: Mar 2005
Location: Savannah,
ga
Cobra Make, Engine: Unique, 351W
Posts: 260
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Not Ranked
Thanks. I've seen those before, but didn't know what they was called. Crow Foot sounds about right!
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04-07-2022, 02:43 PM
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CC Member
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Join Date: Jun 2020
Location: SoCal,
CA
Cobra Make, Engine: BDR build #983, FRM 392
Posts: 380
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Quote:
Originally Posted by w-lewis
Found the bolt torque specs online. 23-25 lbs.
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That is for iron heads. If you have aluminum heads, the max is 18 ft-lbs |
04-07-2022, 03:01 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by SBSerpent
That is for iron heads. If you have aluminum heads, the max is 18 ft-lbs
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And for an alternative opinion... I have an aluminum Blue Thunder intake and my engine builder specifically had me retorque the bolts at 500 miles to 32 ft./lbs. and then never touch them again. And I did, and I used a crow foot, and I recalculated the torque based on the crow foot's impact. |
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