Inlet manifold bolts stripped.. fixable, bad?

[BoomOne]

Hey guys.
If looking front on at the manifold, the back two bold on mine are pretty stripped, they bite a little bit, but are pretty stripped... one more session of taking them out and in will be the end of the tread.

Is this a bad thing or is it still ok seeing as the front three are still un-stripped and tighten fine?

Also, is it possible to get these bolts re-thread?

cheers

 

[sideways danny]

longer bolts might help you in the short term. Helicoils would be a better solution for a proper fix

 

[BoomOne]

longer bolts I've tried, not helping me tho. A re-thread will have to go with the helicoils right? is there enough space to get them re-thread?

Also, in the mean time, is it bad that they have stripped? I mean is it causing damage or anything like that?

Cheers for your response mate

 

[marinemackay2003]

if the rest of them are in should be ok

just re cut the threads a little larger with a die/thread cutter and use a corrisponding size bolt

or helicoil

 

[BoomOne]

cool, thanks dude.

Was just a little worried that it would be causing the car to run a bit lean or something with not sealing properly

 

[sideways danny]

if the rest of them are in should be ok

just re cut the threads a little larger with a die/thread cutter and use a corrisponding size bolt

or helicoil

cutting the thread larger for the next bolt size up is a bit of a last resort. Means you'd need to dril out the holes in the upper half too. Helicoil is simplest, and very strong when done right.


If the bolts aren't tightened right down, then you're risking a vacuum leak which could give you lean running, but you'd likely notice it as the car would run rough.

 

[sideways danny]

if the rest of them are in should be ok

just re cut the threads a little larger with a die/thread cutter and use a corrisponding size bolt

or helicoil

cutting the thread larger for the next bolt size up is a bit of a last resort. Means you'd need to dril out the holes in the upper half too. Helicoil is simplest, and very strong when done right.


If the bolts aren't tightened right down, then you're risking a vacuum leak which could give you lean running, but you'd likely notice it as the car would run rough.

 

[marinemackay2003]

just dont tighten too much, they are made of cheese and will just strip threads.....again :rasp:

its a fine balance

 

[BoomOne]

car is running pretty shitty at the moment.. feels very down on power, but i have issues... see my other thread..

http://www.cliosport.net/forum/showthread.php?552910-Idle-power-loss-and-slight-misfire-issues

so I can put a helicoil in without having to re-thread it? I though helicoils were used once the thread has been re-done (made bigger)

 

[sideways danny]

just dont tighten too much, they are made of cheese and will just strip threads.....again :rasp:

its a fine balance

it's standard practice with aerospace engineering to helicoil any thread into aluminium becuase it's stronger

 

[sideways danny]

so I can put a helicoil in without having to re-thread it? I though helicoils were used once the thread has been re-done (made bigger)

no, you have to cut a new, specific thread for the helicoil to be fitted to. not too complicated. I fitted 49 into a cylinder head a while back where the cam bearing cams and rocker cover had been overtightened and ruined all the threads

 

[BoomOne]

I am feeling slightly retarded, bit too early in the morning for me but.. isnt re-threading and cutting a specific thread for the helicoil the same thing?

lol having to do 49 must have been a right pain