Hiss and smoke - JeepForum.com
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post #1 of 13 Old 08-11-2018, 12:35 PM Thread Starter
NathanOTWeb
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Hiss and smoke

Hello Jeep Peeps!

I took my Jeep on an extended drive on the highway a couple days ago. Got there, didnít notice any problems, but didnít really look.

Got home and now have a hiss coming from either brake fluid reservoir or from side of engine block. Thereís also smoke rising after a minute from around the same area. I also have engine fluid coming out somewhere cause after I drive the Jeep, I get a puddle on the ground. Not sure if related because that was there before.

Donít know enough yet about engines to give more details about location. Iím gonna be doing some reading this weekend to learn what I can. Just gonna post now so answers can come in while I study.

Thanks in advance!

Cheers all!

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post #2 of 13 Old 08-11-2018, 04:21 PM
Spieg8
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do you have power brakes? if so, check the vacuum line for leaks causing your hiss.

smoke would be from something else though (258 is famous for leaking valve covers which can cause oil to drip/burn on the exhaust). You need to identify what fluid is puddling on the ground.

When I was younger, I thought I was Don Quixote... turns out I'm just another donkey-hootie.
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post #3 of 13 Old 08-11-2018, 10:52 PM Thread Starter
NathanOTWeb
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Pretty sure its engine coolant. Its the same color.
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post #4 of 13 Old 08-12-2018, 12:08 AM
gutthans
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Check your freeze plugs for rust-through. 'Smoke' that dissipates is steam (usually) and a rust-through would give a sudden release of pressure as well as 'smoke' and puddling coolant.
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post #5 of 13 Old 08-12-2018, 02:33 AM
82JeepCJ7
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Jeeps don't leak, they mark their territory.....
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Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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post #6 of 13 Old 08-12-2018, 03:52 PM Thread Starter
NathanOTWeb
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Took another look at engine today. Cleaned up as much of the coolant I could and started it up. Now no steam (YaY!). Still can't identify what's hissing, but I think I've isolated it to be underneath the air filter.
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post #7 of 13 Old 08-12-2018, 04:52 PM Thread Starter
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I think its a vacuum leak
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post #8 of 13 Old 08-12-2018, 08:30 PM
BagusJeep
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Get a mirror and torch under the manifold and find the coolant leak. A really bad core plug will look like this
Attached Images
   

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1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
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post #9 of 13 Old 08-16-2018, 10:04 AM Thread Starter
NathanOTWeb
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Just a quick update.

The valve cover gasket is the source of an oil leak. The reason I thought it was the engine coolant was the color, but the oil had some dye put in at a local repair shop to find source of leak. Local repair shop replaced gasket, but its still leaking becaue the gasket is still loose. I can move it in and out with my finger. I'm taking it back to see what they will do about that.

I found and fixed the vacuum leak. Just some worn plugs. $3 box of replacements at local parts store.
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post #10 of 13 Old 08-16-2018, 09:13 PM
gutthans
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Quote:
Originally Posted by BagusJeep View Post
Get a mirror and torch under the manifold and find the coolant leak. A really bad core plug will look like this
That's why I like marine (brass) freeze plugs.
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post #11 of 13 Old 08-16-2018, 10:02 PM
Spieg8
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Quote:
Originally Posted by NathanOTWeb View Post
Just a quick update.

The valve cover gasket is the source of an oil leak.
As I said, the 258 is famous for leaking valve covers. Your '82 would have come from the factory with a plastic valve cover. If yours still has one, I'd throw it in the trash and buy a quality cast aluminum valve cover along with a good gasket (or get used to the smell of burning oil).

And maybe look for a different repair shop as it sounds like that shop is kinda useless.

When I was younger, I thought I was Don Quixote... turns out I'm just another donkey-hootie.
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post #12 of 13 Old 08-16-2018, 11:59 PM
BagusJeep
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Key to a valve cover gasket install is torquing of the bolts. Over torqueing can bend the cover and lead to leaks, it does not make it more secure. Next time the gasket is replaced the cover is no longer flat and correct torqueing will not make it so. if you take your cover off and put a straight edge along the seal area, it should be totally flat. If it is not, get one that is.

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1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
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post #13 of 13 Old 08-18-2018, 05:15 PM
Savemycj
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I know you probably have a plastic valve cover (complete junk, replace that thing) but in the off chance it was replaced in the past with a metal one you can remove it and set it on a flat surface to check for flatness on the gasket's mating surface. Sometimes if a bolt is over-tightened on a metal valve cover the metal around the bolt hole can be "pulled" downward out of flatness and cause the gasket to leak in between the bolts. Take a ball peen hammer and gently flatten these spots back out, set on flat surface and check for flatness, repeat, etc. Torque them properly.
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