# 1997 blazer intake replacement please help **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** used, engines, oil, repair, leaks\ **Created:** [September 24, 2014, 4:45am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333 "2014-09-24T04:45:47Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 4:45am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/1 "2014-09-24T04:45:47Z")
please help me out… i recently replaced my lower intake gaskets, left and right. i can get the vehicle to start,but the coolant is INSTANTLY going into the oil. and i mean INSTANTLY. i cant fill the radiator. did i crack the block or blow the head gasket? or does it sound like something didnt get sealed right? 97 blazer with a 4.3 vortec engine. please help thank you. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 24, 2014, 5:01am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/2 "2014-09-24T05:01:25Z")
Did you apply a thread sealant to the threads of the lower intake manifold bolts? Tester ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [September 24, 2014, 5:02am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/3 "2014-09-24T05:02:42Z")
If everything coolant-wise was ok before the intake manifold gasket change, then something probably went way wrong with the install. The coolant passes through the intake to crossover in the front and rear. If the seal did not seat right, coolant pours straight into the crankcase. At the very least, the intake needs to come back off. ---
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 5:03am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/4 "2014-09-24T05:03:22Z")
honestly i didnt know anything about sealing the bolts. can you explain this in more detail pleaseee? ---
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 5:07am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/5 "2014-09-24T05:07:34Z")
pl thank you busted knuckles. in your opinion do you think i messed up anything on the install?like, damged the head, etc? ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [September 24, 2014, 5:09am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/6 "2014-09-24T05:09:15Z")
That SHOULD have been in the install guide and the repair manual. You do have a repair manual, right? At the very least, you need the manual for the bolt tightening sequence and torque specs. ---
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 5:14am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/7 "2014-09-24T05:14:59Z")
yes sir and i followed the manual precisely… but it said nothing about sealing the bolts? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 24, 2014, 5:16am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/8 "2014-09-24T05:16:23Z")
The lower intake manifold bolts thread into the heads where water jackets for the heads are located. If a sealant isn’t applied to the lower intake manifold bolts, coolant can leak past the threads on the bolts and leak into the engine. The sealant also acts as a lubricant so the proper wet torque of manifold bolts is achieved. Tester ---
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 5:20am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/9 "2014-09-24T05:20:42Z")
thank you tester. now, will this leak be slow or fast? cause i literally could not fill the radiator. the coolant was draining that fast ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [September 24, 2014, 5:22am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/10 "2014-09-24T05:22:36Z")
Unless you heard a snap or pop, chances are the intake manifold gasket slide out of place before the intake was bolted down. ---
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 5:25am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/11 "2014-09-24T05:25:34Z")
when i took it apart again, gasket was still in place. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 24, 2014, 5:28am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/12 "2014-09-24T05:28:24Z")
Does the engine have the plastic upper intake manifold? Tester ---
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 5:35am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/13 "2014-09-24T05:35:18Z")
yes tester the upper is indeed plastic ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 24, 2014, 5:57am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/14 "2014-09-24T05:57:51Z")
Then what you want to check is if the port in the upper intake manifold for the EGR gasses has eroded away. [http://www.dormanproducts.com/documents4rb/Intake%20TechSpeak.pdf](http://www.dormanproducts.com/documents4rb/Intake%20TechSpeak.pdf) There’s coolant jackets around this port that’s supposed to prevent the plastic from eroding away. But the original GM design was weak in this area. So Dorman redesigned these intake manifolds to eliminate the problem. Tester ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [September 24, 2014, 6:04am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/15 "2014-09-24T06:04:19Z")
@settersj19‌ Did you use new intake bolts? I highly recommend it I would use AC Delco parts, or at least Felpro Was the intake and head extremely pitted? Did you get very aggressive when you were cleaning off the old gasket material? What did you use to clean off the old gasket material? Did you use a torque wrench and proper sequence? ---
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 6:15am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/16 "2014-09-24T06:15:47Z")
i used felpro. i also used the old intake bolts.used the torque wrench, followed torque [specs.my](http://specs.my) problem is, its not just leaking now.its pouring. like,fast. instantly into the oil. ---
**Author:** ![settersj19](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@settersj19](https://community.cartalk.com/u/settersj19)\ **Post date:** [September 24, 2014, 6:19am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/17 "2014-09-24T06:19:38Z")
tester, if the port was eroded, wouldnt i have noticed this before the intake change? ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [September 24, 2014, 6:26am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/18 "2014-09-24T06:26:47Z")
If the coolant is literally pouring into the oil as you describe, and you didn’t have this problem before, I think something has gone sideways, backwards, or upside down with your gasket/intake installation. Are you 100% certain the gasket is located and seated properly? Can you take and post a pic of the gaskets as they lay on the head, and of the sealing side of the intake? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 24, 2014, 6:54am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/19 "2014-09-24T06:54:11Z")
Okay. Remove both valve covers. And try slightly tightening the head bolts to see if one has broken. I’ve only seen it happen once on this GM engine. So if it’s happened once, it can happen again. Tester ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 24, 2014, 6:54am UTC](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333/20 "2014-09-24T06:54:39Z")
Okay. Remove both valve covers. And try slightly tightening the head bolts to see if one has broken. I’ve only seen it happen once on this GM engine. So if it’s happened once, it can happen again. Tester [Next page](https://community.cartalk.com/t/1997-blazer-intake-replacement-please-help/87333.md?page=2)