1991 Terrano TD27T Intake Manifold Removal

[kmb]

Hi all,

I have a small diesel leak somewhere around the injector pump and I'm in the process of a bit of dismantling so I can get in there and have a closer look. Is it possible to remove the manifold with the injector pipes still in place? I've disconnected them all at the injector ends and that gives enough wiggle room to get out all the manifold bolts except one (4th from the back), which has a pipe junction right over it with a hose coming off running under the manifold - and the bolt is right under the hose. I can get the hose off, but that still doesn't quite give enough access to the bolt head. Do I need to remove the injector lines completely to get the manifold off - and if so how do i get access to them at the pump end to disconnect? Or is there something I'm missing .... It feels like this should be easy but I just can't see a way to get at that last damn bolt.

Cheers

Kev

[travis2ninja]

Yes, should be pretty straight forward. just need to take of all manifold bolts and wiggle past the injector lines.
Is the fuel coming from the injectors or the injector pump?
There is only 3 fuel lines, and if any of them should be able to see and replace without removing the manifold.

Here are some photos with the manifold removed and injector lines still in place.
If you do remove the manifold i would definitely clean it also, it will be full of oily exhaust dust sludge !

[kmb]

Yes, should be pretty straight forward. just need to take of all manifold bolts and wiggle past the injector lines.

In your first picture, I can see your 12mm ring spanner on the block. Directly down beneath the ring end of that spanner is the injector that is causing me grief, the one with 4 lines coming off it's housing. I just can't get at the bolt directly beneath it - even with the lines removed at the injector end. But obviously you managed it so I'll just persevere and see if I can wiggle it a tiny bit more

Is the fuel coming from the injectors or the injector pump?

Pretty sure it's from the pump - totally dry from the top third of the pump upwards and wet around the middle to bottom area of the pump. Had it up on a hoist idling at the local garage and could see it dripping slowly from the pump area.

If you do remove the manifold i would definitely clean it also, it will be full of oily exhaust dust sludge !

Yes for sure - it looks worse than the one in your picture. So it's coming off for a clean anyway, and then I'll get a good look at the pump.

Thanks for your help - really appreciate it.

[fh2014]

If I recall correctly I had to bend a line slightly to get at one bolt . Hard the 1st time but after you've done it once the next time you'll do it in minutes

[travis2ninja]

I just had a socket with extention on the Rattle Gun and got at all the bolts.

[altair]

I'll bust in on this thread, I need to do mine as well, leak in the front on my IM.

Does cleaning the manifold out actually help anything? I mean as in running or power? My Mistral has got the acceleration of a snail...have heard they are gutless, but I dunno how Nissan got away with selling these, with the total lack of power they have.

Also have heard oven cleaner is the way to go, any other tried and true techniques we can do at home to clean out the manifold?

Thanks guys.

[fh2014]

I'll bust in on this thread, I need to do mine as well, leak in the front on my IM.

Does cleaning the manifold out actually help anything? I mean as in running or power? My Mistral has got the acceleration of a snail...have heard they are gutless, but I dunno how Nissan got away with selling these, with the total lack of power they have.

Also have heard oven cleaner is the way to go, any other tried and true techniques we can do at home to clean out the manifold?

Thanks guys.

I had a diesel terrano with 190kms on clock. Cleaned intake manifold, intake piping and intake ports on head. Must have removed close to half a kilogram of muck. Would estimate port size had decreased about 25% over its life.

No word of a lie it went from 60km/h 100% throttle 4th gear to 100km/h 60% throttle in 5th gear up the same gradient. Like it had a new set of lungs.

Clean your intake.

[altair]

thanks for that, sounds like a weekend project!

[kmb]

Holy s**t - just realised it's over 2 weeks since I started this thread! Got caught up with work and family stuff and only just managed to get around to the manifold again.

Anyway ... for the sake of anyone else who's doing it, I finally realised how to get off that last bolt (and all the others actually). Instead of coming in from the top of the engine and using a ring spanner, you come in from the left with a longish socket extension *beneath* the manifold. What a muppet! In my defence I was trying to do it in a dimly lit garage holding a crappy torch in one hand. Once I pushed it out in the sun it was fairly obvious. Anyway, I can get it off and on again now easily in less than an hour - done it three times already trying to track down this flipping diesel leak. But that's for another thread ...