Exhaust manifold help, 78 FJ 40

[Mark Jennings]

I have a bin box of brass nuts I have pulled off of manifolds over the decades. All are 10mm/F engine. I have never seen a 12mm nut on a 2F.

Well, maybe it’s time to stock a few....also use brass on the manifold flange nuts and copious amounts of Never-Sleeze on the studs....basically anything exhaust related....you don’t want to ‘break’ or cut off in the future.

 

[Goldbug]

@Chestcutter or others, I am trying to tackle a leak from my manifold to exhaust. Only 2 of the 3 studs are there. The 3rd was not there since I acquired it and the hole in the manifold is stripped. I assume I'll need to put a helicoil in, but wondering if I should try a TIME-SERT instead. I'm going to try to do it without removing the manifold, at least at first. Not sure I'm up for the complex surgery seen here.

Anyone know what size helicoil or time sert to order?

Already ordered the gasket and replacement studs from local dealer.

 

[Chestcutter]

Anyone know what size helicoil or time sert to order?

I think that’s an M10 stud. I’ll check when I get home. Time sert is definitely a very solid repair but expensive and requires a bigger hole. Helicoil might be worth trying if the threads are stripped but the hole is otherwise in good shape. Definitely a cheaper option for a single repair.

 

[65swb45]

The F manifold studs are 10mm. The 2F are 12mm.

 

[Chestcutter]

Exhaust manifold to pipe?

 

[Chestcutter]

@Goldbug my studs have all been replaced with non-metric with helicoils which are rusted in place, but my not yet used toyota studs are M10x 1.25

 

[Goldbug]

Thanks. Yeah, looks like M10 x 1.25. Ordered helicoil since hole looks pretty clean. TIME-SERT looks good but $$. Will try Heli-Coil first. A little worried about heat tolerance but we’ll see. Sounds like a pizza delivery car right now!

 

[jestlurnin]

Anyone have Toyota part numbers if I wanted to switch all my 2F manifold fasteners to studs only?

 

[fj40fillet]

So when I was young....hahahaha....I worked at a VW dealership, e.g. 40 hp was still a new thing, and when we did valve jobs/mufflers, we used brass nuts on the exhaust studs....so the next mechanic doing the job....and there always was (is) the next guy....could get it apart without breaking the studs.

My 68 Land Cruiser that I bought in 1994, one of the first fixes was replacing a cracked exhaust manifold....and the installed nuts were brass...I assumed they were factory.....they’ve been on there forever. And I have never had issues with the studs breaking.

Head to NAPA or True value and use brass on those high rust components, think of the next guy....

Do the brass nuts hold up to the OEM torque specs without stripping?

 

[Mark Jennings]

Do the brass nuts hold up to the OEM torque specs without stripping?

Yes they do…..however, getting a torque wrench in there to measure will be a challenge. I just snug them up evenly…..

 

[Mark Jennings]

Yes they do…..however, getting a torque wrench in there to measure will be a challenge. I just snug them up evenly…..

Just for fun, I googled up Brass Exhaust Manifold Nuts….seems the Brit’s used them on early Jag’s and big Healy’s, you can also get ‘heavy hex’ brass nuts, they are longer than standard nuts, more thread engagement, better to ‘reef on’ to get a good gasket compression.

 

[1911]

Just for fun, I googled up Brass Exhaust Manifold Nuts….seems the Brit’s used them on early Jag’s and big Healy’s, you can also get ‘heavy hex’ brass nuts, they are longer than standard nuts, more thread engagement, better to ‘reef on’ to get a good gasket compression.

Having owned (been afflicted with) several british motorcycles and cars, I would not be in a hurry to emulate their mechanical or electrical prowess. YMMV.

 

[Mark Jennings]

Lucas Electrical, many a Hillman up in flames

 

[island45]

Lucas Electrical, many a Hillman up in flames

Didn't Lucas also create intermittent headlights?

 

[1911]

 

[charliemeyer007]

Lou Cuss

 

[iron crush]

@Chestcutter
Can you please tell me where you got those caps for your smog air injection ports? I’ve been looking for those and I can’t find them anywhere. Would greatly appreciate it trying to remove my Smog air injection rail on my ‘68 Fj
Thanks

 

[Chestcutter]

@Chestcutter
Can you please tell me where you got those caps for your smog air injection ports? I’ve been looking for those and I can’t find them anywhere. Would greatly appreciate it trying to remove my Smog air injection rail on my ‘68 Fj
Thanks

Mine came with the caps. It was desmogged, not well, before I got it. I have seen kits like this

Toyota 2F Engine De-Smog Kit for 1980-1987 Toyota Land Cruisers - Landcruiser Parts

Toyota 2F Engine De-Smog Kit for 1980-1987 Toyota Land Cruisers. This kit is designed for de-smogging your Toyota Land Cruiser engine.

manafrelv.com

Though this is for later engines. I know one of the luminaries here will know the proper sizing for those. Good luck

 

[65swb45]

@Chestcutter
Can you please tell me where you got those caps for your smog air injection ports? I’ve been looking for those and I can’t find them anywhere. Would greatly appreciate it trying to remove my Smog air injection rail on my ‘68 Fj
Thanks

Jim Chenowith, a well-respected MUD vendor, sells a very affordable kit that will have more than you need for a fraction of the price of BTB:

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