Kangaroo petrol ?

[Webbo]

Well, I put some new ngk plugs in this afternoon and that seemed to sort it , though I do kind of think fuel quality might have played it's part. However my pleasure was short lived as I could hear an ominous rumbling/knocking noise coming from the engine. Oh well, that will get my attention for the next few weeks I suppose.

many thanks for all your input. 

Stu 

[Pete Lewis]

Youre not having much luck

is this sounding like a bearing problem????

[Webbo]

not entirely sure what to listen for when it comes to determining which bearings are playing up.

[Pete Lewis]

a large wooden screwdriver  held against components or engine block with ear on the handle will help locate   bit like using a stethoscope

 

dont get it in the fan or AE have to extricate it

 

Pete

[Webbo]

duly noted. could not seem to hear it today. getting a reading of 70psi cold to 60psi warm on the oil pressure gauge, but will try the screwdriver thing.

thanks,    Stu

[Webbo]

hi ,

well, car back to rough running after a very brief spell ok. after putting in new plugs car seemed to run as it did before the winter, sorted , or so I thought.  No way, so I bought more new fuel and tried running it straight from the can, no change, 

checked the plugs, sooty black !  Cleaned plugs and put the newer  carb back on ,again !!!  It started well and ran ok for a moment but fuel started coming out of the float chamber gasket and then it stopped.

 Took off float chamber and pulled a sliver of rubber out of the float valve, (there seemed to be a fair amount of tiny black specs in the float chamber that have managed to evade the in line filter)   put it back together ,started it , made a faint pop and white smoke came billowing out of the air filter, never done that before.

Disconnected the battery, turned garage light out , went indoors . Fed up.

[DerekS]

Don't despair Stu, you WILL get sorted, I promise. As you've found, it only takes the tiniest bit of crap in the float valve to cause chaos and it looks like your engine has been flooding. How about leaving the plugs out for a while to let it "vent", dry out? I've seen a few posts here centered around the effect of modern petrol on black hoses and it's maybe this is the root cause of your problems. A daft suggestion, if I get a problem like this, I put down on paper what I've done, what's happened/happening etc, it can help to clarify your thoughts. Keep the posts going as well because sometimes they go down the "list" and don't attract attention. Keep your chin up, you WILL crack it!

[Webbo]

HI derekskill,

had a bad day yesterday. Today put some new unleaded fuel hose on , checked the spark at the plugs, seemed ok they gave a reasonable yellow spark, and cleaned the plugs which were badly sooted up again , I don't think the mixture is that rich.  Anyway it started well and ran well for only about 30 seconds and then went back to the lumpy running. I am wondering if the plugs may be the problem, they are a new set.   I am running alden electronic ignition, with ngk bp6es plugs . Do you know if standard plugs are good for electronic ignition ?

cheers , Stu

[Gully]

NGK BP6ES work fine on my GT6 with electronic ignition and have done since before I owned the car (so 4+ years at least).

 

Gully

[Pete Lewis]

Ive been fighting a area MkIV misfire ,which runs fine for 3 minutes then really play up, been through everthing and getting rather peeved

its had new plugs , and with senior moments after ripping the car apart , pulled a plug

 

itsngot a ruddy R in the suffix, something I know all about but the idea escaped the grey stuff

so we had 2 BP6ES bright and white, and 2BPR6ES black and sooty,

 

our coils wont fire resistive plugs , I know that , but missed the obvious. Its them darn slippers at work

 

anyway after hair pulling and teeth nashing and feeling a right R's the R's have gone

 

must try harder

 

Pete

[Webbo]

Thanks for the reply gents.

 Think I need to find out why the plugs are getting so sooted up. The carb has been reconed and seems to work as it should and the mixture, I think ,is set about right. When  the engine is running I shut the choke off as soon as I can and leave it to run for a while so it warms right up, but the plugs still soot up.

A couple of times the float chamber has flooded, could this cause the problem ?

stu

[Pete Lewis]

Strombegs dont realy suffer from float needle problems but the magic slives of hose can end up jamming the back of the valve

And nothing lasts for ever , the seats do wear out

 

its worth checking the float height and on later carbs there are two valve arms you can fit the float upsidedown

 

you will have a thames barrier style choke not an enrichment valve , so providing the air dam is flat with the throat ..its off.

 

make sure no gaskets are masking the front face ports

 

make sure the plugs dont have an R in the letters

 

check the 0 rings on the jet are sound and the top boss sealing washers are fitted

 

if you femove the top cover check looking downnthe two vacuum holes in the bottom of the air piston are facing the engine then you know the diaphragm is in correctly located

[Webbo]

Thanks Pete,

looks like another carb strip down again. Still its quite a therapeutic pastime.

Cheers   Stu

[Paul H]

Thanks Pete,

looks like another carb strip down again. Still its quite a therapeutic pastime.

Cheers   Stu

Hi Stu - got the teashirt on this one even made a dedicated spanner, the spanner thickness has been ground down so fits the manifold nuts easier + the obligatory towel underneath to catch the washers -  30 mins to take off , and put back 

 

Paul 

[dougbgt6]

30 mins off and on! That's fast. Oh, the sinking feeling, when you realize they godda come of AGAIN. I got that T shirt.  

[DerekS]

Pete, if you see this, can you confirm... In one of Stu's posts he says that he is getting a "reasonable yellow" spark at the plugs, shouldn't it be blue-ish, or am I confusing this with the Colourtune spark? I'm wondering if it's a clue. ( I can't stand the thought of anybody losing heart)

Thankyou.

[Pete Lewis]

honour and offer sounds a old plan.

 

a lot can be done with it in situ, ,, understanding the float is best off

 

buckeye triumphs have some good clues , never mind its aimed at TR , the basics are all the same   

http://www.buckeyetriumphs.org/technical/Carbs/CarbsI/CarbsI.htm

 

 

as for yellow  that sounds a bit low temperature sparks jumping   is the coil correct and is the condenser working ????

 and  Derek  yes Blue on colour tune  is good,         yellow is rich,,            firing   blanks  is weak

 Ive always found the ears tell you a similar story even as rough as that sounds better ...!!

 

 

pic of double armed float 

 

[DerekS]

Thanks Pete. Honour and offer, that's a lead-in to an old joke, isn't it?

[Pete Lewis]

I can remember the joke but forgot what its all about 

 

I get to the top of the stairs but nowt happens these days 

 

I blame those bl**dy slippers 

 

Pete

[DerekS]

It's about some newlyweds,

She offered her honour,

He honoured her offer

And all weekend it was honour and offer.

I'll get my coat.

[Pete Lewis]

The wife wouldnt understand any of that

 

pete

[daverclasper]

Hi

 

Sorry if Interrupting the thread a bit here. Pete, what are the top boss sealing washers and what happens if there no good?, also if the small jet O rings are Knacked, does this mean it can run rich? please, (assumed it would mean fuel would leak from bottom of jet holders). Asking, as I think got a possible long term issue with setting mixture ok for both city driving and cruising.

 

Thanks, Dave

[Pete Lewis]

care of Canley,  have a look at 51 52 53    the jet has 0 ring, the top support bush has alloy washer to seal it,   any missing or scored up will let fuel out from around the jet holder not through  the jet orifice

Pete

 

 

 

[daverclasper]

Thanks Pete

 

Will have a look when car not in use and a have few hours time.

 

Cheers, Dave

[Pete Lewis]

You can drop the jet assy and adjuster out without removing the carbs

 

pete