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1997 Geo Prizm 1.6L exhaust manifold keeps cracking


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Filroy77
New User

Mar 2, 2017, 7:16 PM

Post #1 of 9 (250 views)
1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In

The original cracked and I replaced it with a dorman from rock auto. That one cracked and I read somewhere that those were defective but they had fixed the problem so I bought another one. Lasted awhile but cracked again. What is making the manifold crack? This car has 312,000 miles and runs well. I've had it since 1998 and maintained it at regular intervals.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 2, 2017, 11:26 PM

Post #2 of 9 (238 views)
Re: 1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In

! 312K - wow.
OK, This is to say the first lasted over 300K and now two replacements have "cracked" again and again - right?


Is this cracking in the same spot on the manifold? If so it may be getting too hot there or just torque on engine perhaps weak motor mounts are putting too much force on it?


IMO think you should rule out weak mounts first and look where it cracks for clues of possible excessive heat right there vs other areas of it,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 3, 2017, 6:46 AM

Post #3 of 9 (231 views)
Re: 1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In

Do you have a splash shield missing from below allowing cold water to splash on the hot manifold?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 3, 2017, 6:54 AM

Post #4 of 9 (227 views)
Re: 1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In

Excellent thought HT. Haven't seen those last for crap never mind 20 years, 300+K!


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 3, 2017, 6:57 AM

Post #5 of 9 (221 views)
Re: 1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In

Doesn't surprise me. It's a Toyota.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 3, 2017, 7:21 AM

Post #6 of 9 (215 views)
Re: 1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In

That stuff is all over the sides of the roads and IMO only chance is to routinely paint up nuts, bolts or spot welds on the whole area. I haven't been finding this stuff new separately or looking in the wrong places. Most want whole new OE parts that would come with it,


T



Filroy77
New User

Mar 3, 2017, 11:58 AM

Post #7 of 9 (198 views)
Re: 1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In

You know I've had this car for so long I can't remember if it had a shield. I think it had a small one, unlike my 2010 Honda Accord has one that covers the whole engine bay.

It makes a lot of sense. The manifold cracks in the same place, right in front where you can see it through the slots in the heat shield.

Would some kind of ignition problem cause this and how could I check?

I'll look around the interwebs and see if I can find the shield or the junk yard.

Thanks for the clues so far and any further advice. :)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 3, 2017, 12:02 PM

Post #8 of 9 (196 views)
Re: 1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In

Yes, a misfiring engine will cause the manifold to overheat but the sudden cooling will hasten the crack.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Filroy77
New User

Mar 3, 2017, 2:25 PM

Post #9 of 9 (176 views)
Re: 1997 Geo Prizm 1.6L exhaust manifold keeps cracking Sign In


In Reply To
Yes, a misfiring engine will cause the manifold to overheat but the sudden cooling will hasten the crack.


Thank You Sir.






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