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Re-Assembling H25A
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Author:  DangerMuppet [ Mon Jul 20, 2020 11:03 pm ]
Post subject:  Re-Assembling H25A

Hi Zookers,

Hoping someone can give me some pointers please.

Ive replaced the rocker cover gaskets on my 2.5 H25A but having some issues fitting & getting everything back together.
I.e the throttle body & fuel rails etc & which order to re-add them in so you can reach all the bolts etc.

Ive searched youtube & I still am but wanted to ask here if anyone had some pointers to assist me with this please if possible.

If theres a video of this or something that would be great but obviously any help is appreciated.

Also with the spark plugs do I need to buy a special 16mm spark plug socket or am I missing something?

please help, cheers.

Author:  ZUZUKI [ Tue Jul 21, 2020 9:25 pm ]
Post subject:  Re: Re-Assembling H25A

To start with your last issue 1st.
Yes, you will probably need a special thin wall socket - if your current one doesn't fit. Not too hard to find though.

The design of the top of the H20/25/27 is a painful thing - more fiddly & complicated than it needs to be.
I've done what you are doing a couple of times & must have 'blocked it out' - I know I used a wobble ended 3/8" drive extension to get to the lower nuts on the throttle body, but it's a PITA regardless.
It's not more complicated than it looks (I admit it does look bad though), so layer it up from the heads - intake manifold > injectors & rails > throttle body branch > throttle body, with lots of little steps along the way.

Good luck,
Rgs, Michael

Author:  DangerMuppet [ Tue Jul 21, 2020 11:56 pm ]
Post subject:  Re: Re-Assembling H25A

Hi Michael, cheers for the reply.

We battled through it & its all back together now thank goodness.
But its running quite rough & seems to be sucking air in somewhere from the sound of it.
Might have to find someone whos more familiar with these cars.

Author:  ZUZUKI [ Wed Jul 22, 2020 10:19 pm ]
Post subject:  Re: Re-Assembling H25A

Could be from an injector seal?
The old 'trick' was to spray a little carb cleaner / start-ya-bastard carefully & selectively around seals & gasket joins to see it the engine smooths out or increases speed. Not a terribly safe practice though, so these days a 'smoke test' is better, but needs a machine to do it.

Could also be worth checking that the electrical plugs on the injectors are fully engaged & locked on.

Rgs, Michael

Author:  DangerMuppet [ Wed Jul 22, 2020 10:51 pm ]
Post subject:  Re: Re-Assembling H25A

ZUZUKI wrote:
Could be from an injector seal?
The old 'trick' was to spray a little carb cleaner / start-ya-bastard carefully & selectively around seals & gasket joins to see it the engine smooths out or increases speed. Not a terribly safe practice though, so these days a 'smoke test' is better, but needs a machine to do it.

Could also be worth checking that the electrical plugs on the injectors are fully engaged & locked on.

Rgs, Michael



Yeah a couple of people have suggested a similar test cheers.
I changed the spark plugs today so its going a bit better now but still something not right so will try more tomorrow.

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