free hit
counters
Exhaust manifold removal - Induction/Turbo/Manifold/Exhaust - The Lotus Forums - Official Lotus Community Partner Jump to content


IGNORED

Exhaust manifold removal


Recommended Posts

Before my engine goes back I decided to replace the gaskets on the exhaust manifold.  Nuts were rusted to nearly nothing so right thing to do.  Now got all 12 nuts off and soaked the area in WD40.  I am expecting the manifold to be stuck fairly fast  has anyone got any tips on free it off?

Thanks

Link to comment
Share on other sites


Upgrade today to remove Google ads and support TLF.

Penetrating oil or acetone/ATF blend around the studs for a good soak. Any sticking would be due to corrosion packed around the studs, I would think the iron manifold would pop right off the aluminum head.

Link to comment
Share on other sites

  • Gold FFM
23 hours ago, PhilW said:

I am expecting the manifold to be stuck fairly fast  has anyone got any tips on free it off?

Rubber mallet

Only here once

Link to comment
Share on other sites

  • 4 weeks later...

Well its been soaking for all of February.  Will not budge.  Assuming it is corrosion around studs.  Now looking at heating the manifold around stud area but only have Mapgas.  Not sure it will heat quick enough before heat dissipates.

Any other suggestions anyone.

 

Thanks

Link to comment
Share on other sites

A wooden block struck judiciously with a substantial hammer would be my escalation exercise at this point. Impact shocks in a shearing direction, not so great as to bend the studs. Next level would be to, again judiciously, drive slim wedges into the gap between head and manifold, mindful of unduly marring the sealing surface of the head. Start with metal putty knife then move up to thicker implements. Wedging force is quite immense.

Best of luck

Link to comment
Share on other sites

  • Gold FFM

Wood, smacking holy hell out of it with a mallet and plenty of swearing.

if you like soaking things and waiting - then drench it in brake fluid 

Only here once

Link to comment
Share on other sites

I had the same problem with mine originally, as in addition to the 8mm studs being tight in the manifold with rust, somebody had used some sort of sealant which further bound up the studs.   It was a ****ing nightmare!   Ended up bolting the head to the bench and attacking the manifold with baulks of wood, wedges, heat etc.  Hopefully yours wont be that bad!   When I refitted, I drilled the manifold holes to have slightly more clearance.   Since then I have gone for Alunox, which makes such problems a thing of the past!

NB - I would recommend using the HC laminated stainless steel gaskets on reassembly.

Edited by 910Esprit
Link to comment
Share on other sites

Use the Mapgas to heat only the studs, this may have a better chance of shocking the rust into submission. :) 

It's getting there......

Link to comment
Share on other sites

Thanks guys.  Suffering quite badly with COVID at the moment and I am never ill.  Probably have an hour on it later if I can face it.  3 jabs as well.  Dont want to think if i hadnt had a jab!

  • Sad 6
Link to comment
Share on other sites

Best wishes Phil, hope you get better soon. 

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...