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intake leak

 
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  #1 (permalink)  
Old 11 Sep 2016, 08:51 pm
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Default intake leak

Hi Everyone
I had a issue where the upper intake gaskets were failing (you can hear the air sucking in by the radiator cap). I installed new ones. The car runs much better, no more rough idle and stalls. However I still feel and hear air getting sucked in on that back left corner near the radiator cap. My questions is, do I need to use some sort of RTV sealant? These gaskets are rectangular and there are 4 of them. I don't see a crack in the plastic anywhere.. should I consider replacing the upper intake?

Thanks
Anthony
2005 PT cruiser Base Model
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Old 11 Sep 2016, 08:58 pm
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Default Re: intake leak

Welcome to the forum
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Old 11 Sep 2016, 09:17 pm
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Default Re: intake leak

Welcome to the forum.

Are you using the correct torque and tightening down the bolts of the upper intake in the correct sequence?

105 Inch pounds 5-3-1-2-4
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Old 12 Sep 2016, 12:44 am
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Default Re: intake leak

Quote:
Originally Posted by tnyl83 View Post
Hi Everyone
I had a issue where the upper intake gaskets were failing (you can hear the air sucking in by the radiator cap). I installed new ones. The car runs much better, no more rough idle and stalls. However I still feel and hear air getting sucked in on that back left corner near the radiator cap. My questions is, do I need to use some sort of RTV sealant? These gaskets are rectangular and there are 4 of them. I don't see a crack in the plastic anywhere.. should I consider replacing the upper intake?

Thanks
Anthony
2005 PT cruiser Base Model
Welcome to the forum.

Has the engine been overheated?
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Old 12 Sep 2016, 04:36 am
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Default Re: intake leak

pressurize your intake system and spray it down with soapy water at the mating surfaces to check for the source of the leaks
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Old 12 Sep 2016, 11:16 am
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Default Re: intake leak

I didn't use the torque specs, just tightened till snug. I will do that and post update after.

Thanks
Athony
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Old 12 Sep 2016, 11:25 am
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Default Re: intake leak

Quote:
Originally Posted by tnyl83 View Post
I didn't use the torque specs, just tightened till snug. I will do that and post update after.

Thanks
Athony
Oh my, I'm afraid you might get beat up a little on here for not following the torque specs.
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Old 13 Sep 2016, 08:09 am
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Default Re: intake leak

Get yourself a set of torque wrenches. Even the cheap Harbor Freight ones at ~$20 are better than "feel". For around $60, you can have a 1/4", 3/8" and 1/2" set of torque wrenches that would cover everything on your car. You'd be surprised at how little 8.75 ft-lbs of torque is.

The previous owner of my PT stripped out the brass insert on the front of my intake manifold. Fortunately it was not causing a leak but it wasn't holding anything down either. A JB Weld job fixed it but there are probably better adhesives suited for the plastic.
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