still same engine problems

hi
So currently i have some problems considering the 2.25 petrol engine (military24volt)

First of all the carburetor isn't properly set up : (it's the zenith one)

It doesn't runs without the choke on so i think there is somewhere something causing this issue, although i have replaced all the parts with an overhaul kit from britpart... what parts need to be examined/cleaned???? then i need to adjust volume control screw. (full in 2 turn out approx)

Secondly i don't know if the piston rings are worn or the valve stem oil seals are worn:

The engine doesn't fires on the second cylinder. I have replaced the spark plugs with new one's and they all work! I tried it by taking one by one the plug out of the block still with the leads attached to them and then wired them to a good earth..
Is this caused because of the valve stem oil seals????

Other works i did : -adjusted valve clearence
-adjusted the timing
-replaced head-gasket and the others gaskets

does the compression test only shows me how good/bad the rings are???
Need to buy then such a compression test tool and the tool to remove the valve springs....

How do you know #2 isnt firing? A dodgy ht lead can give an intermittent firing symptom. Do a comp test dry then with a squirt of light oil in the chamber, an increase here denotes worn rings. Low compression can be caused by warped heads, blown gaskets or holed pistons!
Did you lap your zenith to account for warp? dont assume its fully clean also unless you doaked it all in carb cleaner for 24hrs then blew all orifices with 20psi. Throttle spindles can wear causing a lean mix too. Make sure you read the zenith service bulletin and check float height, all jets etc.... or just buy a new weber 34ich and forget about the.zenith.

What Ronseal said but poor compression can also be down to valve problems (incorrect lash, cracked, sticking, pitted etc).

Two (cheap) things worth getting for your situation:
borrow / buy a compression tester - shouldn't be expensive.
Get hold of a colourtune plug (amazon for £25 or so) this will help you get an idea of how each cylinder is working and is a good way to check your carb is set up and working right

If you have more money a wideband lambda sensor or exhaust gas sensor is good.

Not sure about the Weber ICH though. If you've got time (to make the revelant bits) and money fit a DMTL32/34 off a defender or get one of the SU kits. But before bolting new bits on its always worth finding out what is broken!

Your totally right Dom its often a bit silly to just bolt on a new part when you can fix the old one but i was in a similar position of fitting 2 zeniths recon'd by myself and then a brand new copy Zenith, all failing to run right!

I just got frustrated and bought the Weber for a good deal brand new. I have to say its been flawless and runs very well.

The Zeniths are sat waiting for me to have time to properly delve into them but I know the brand new one has a dodgy accelerator pump which is an easy fix. It was a case of just wanting to get out on the road rather than sit in a cold garage fiddling with carbs. They are both fun I know but the former won through!

Sorry, ronseal, advice wasn't for you just pointing out to OP that he'd best diagnose the 2nd cylinder problem before bolting on more bits. I'm with you when my 34ICH started being unreliable I just bought new....though there's nothing I enjoy more than standing covered in oil in a cold garage dicking around with a dodgy carb!

If its missing spark then that's a different kettle to missing compression. Later might be what's upsetting carb if a valve is broken...if former I'd still fix that before even touching the carb!

Si first of all i am going to test the compression, i am going to borrow one from my cousin...
i am pretty sure the valve stem seals have gone cause it wasn't running for nearly 10 years before i bought it. the landy only has 25 000 km on the clock which is good as there is no rust at all !!

it is just stupid of me that i haven't replaced these seals when i had the head of the block to change the head gasket and some damaged threads.... :doh:

for the carb , i strip it completely and i will put it then in carb cleaner
float height is perfect but the jets??? i think i replaced but not sure because i don't know where they are located.... I will have a look in the manuel ...

thank you both for your help

+1 on the Zeniths, though I have one on my 109 that runs right - after heat-treating and lapping (touch wood).

if #2 is not firing cxonsistently I would be looking at compression as stated above - also make sure you have the HT leads to the cap properly - seen far tooo many 2.25s running with 2 &3 leads swapped..

I would also try swapping the leads between cylinders - if the valves are doing their thing and the compression is OK then there has to be an electrical issue there - or a mud dauber has built a nest in your intake.

ajr

with the ht leads is everything alright, they are in a good condition +new plugs + connected how they should be.

and there is spark on all plugs ( checked it by taking plugs out of block still connected to electric and the wired them to a good ground , i could see the spark at every cyl.)

OK, sparking outside the engine is no guarantee it works with compression in the cylinder - been bit like that more than once. What was the compression like?

I haven't tested it because i still didn't got the compression tester :/ next week i am going to pick it up because i haven't got time this weekend sadly
i will upload pics if interested ?

evening ,
i have got some good news , compression test showed that every cylinder has the same compression :clap2:
11 bars
Is that good enough? :confused2:
Could it be because of the valves wrong adjusted ??????????

That comes out at 159 psi (book is 160) so spot on!

Next thing is check plug leads in right order, I doubt its a carb related issue if its just one cylinder playing up.

If there was anything wrong with your valves you'd have crappy compression figures so I'd say you're ok there.

thank you for the advise i going to have a closer look at the carb, to finally find what's going wrong