just replaced head gasket on my cosworth and forgot to mark rotor arm pully so set it up to the line as supposed to and now the car will only run with plug leads 4321 instead of 1234 why would this be please help

 

They are wrong on the dizzy cap?

 

Are you sure you lined the rotor arm up correctly? Sometimes it's easy to make a simple mistake at the end of a big job.

 

Second that check dizzy cap

 

The timing is supposed to be 1342 for a start

 

ive never heard of any engine with firing order 1,2,3,4 fpmsl lovely engine thatd be running balance

 

Get a workshop manual if you intend to work on the car.

 

the leads on dizzy are spot on and timing is set up same as in manual its just plug leads should go 1234 in head but only runs 4321 in head i timed the rotor arm to the little notch the metal bit on rotor arm is spot on with the notch

 

Take all the leads off and put then on the head end first, then that way your numbers will be in the right order, you obviously have them back to front currently.

 

im been thinking is it the opposite end of the rotor arm that faces the notch as leads are on dizzy spot on

 

If you had put it just 180 degrees out, it wouldnt have them going backwards, it would be 3412

 

right today iv changed the rotor arm around the other way and no joy iv tried everything really and it will only run 4321 and at about 1500rpm it holds back i dont know whats happening iv rebuilt many cars before and never came across this

 

also i didnt touch the leads at distributor end and was running fine before

 

Take cam cover off so you can see the valves opening and shutting, turn it around until you can see each cylinder going to the end of the compression stroke, and see which post on the dizzy cap the rotor arm is pointing at for each one and it will show you which lead goes where.

Sounds like when you did the belt though, you didnt properly line up the dizzy drive pulley or the dizzy itself.

 

my dizzy drive pulley dont line up when rotor arm is lined up

 

Well then you need to pull the dizzy out, turn it round, and stick it back in again in the right place if you want it all to look as per the book.

 

just want it back how it was really also its got adjustable cam pulleys and they had no timing marks so made my own if they was both a tooth out would it cause this to happen?

 

where in kent are you m8

Steve

 

 

you need to start from the begining pull all the plugs out roll the motor till number 1 is up top them look where all the timing marks are they need to be 100% right

 

aylesford/maidstone also that diagram is exactly how my timing is setup and will still only run 4321 and leads on distributor is fine 2

 

avoid working on engines in future.

 

pmsl avoid working on engines i rebuild bmw scoobys 200sx rs turbos ect ect before with no problems and i mean full engine rebuilds its obviously something stupid but its finding it

 

TBH I really don't understand what you mean with 1234 or 4321? Don't seem to make any sence since the firing order is 1342.

 

the plugs are numbered and the go in rocker cover 1234

 

yes thats right they go down the rocker cover as 1234 but thats not the firing order as has been said its 1342 which you can work out of the rotor arm and the dizzy cap

 

did you have the cams out of the head ?

 

Your 180 deg out, someone turned the engine . Remember piston 1 & 4 are both at the Top. Your banging number 4 when you should be banging number 1 .

6 cylinder engines can fire 123456 ( some Supras do) but a 4 cylinder cant fire 1234.

 

like this

 

mine will only run with leads round opposite way in head also cams haven't been removed

 

leave the fords alone tommy!!! get back to the scoobys... ill have the sierra off ya tho!!!

 

na mate cant sell the sierra even if it is pissing me off lol

 

with the plugs out and put the bottom pully on it TDC check the top pully,s then check aux pully that its timed up on the center of the harf moon then check the rotor arm to see that its lined up with the small cut in the dizzy and all so when timing it up and the begining check that number 1 is at TDC if it still will not run you are rong on the HT leads on the cap

 

didnt think id seen ya in it for a while.... ask ya old man or ya brother and that if anyone wants to buy my rs2k 4x4?? need to get a van

 

why you want a van?

 

gonna need one for work!! gutted bout having to let the 4x4 go but cant afford to get a van if i dont sell it!


whats the sub and amp and 6x9's like that terry is selling?

 

You have got the timing 180 out. The cam pulleys have twice as many lobes as the crank pulley, so it takes 2 turns of the crank to turn the cams once.
If you look at your picture it will show you that when you fit the leads 4321 on the head no 4 is then TDC So when the rotor arm turns clockwise as in the diagram the firing order is 4231 whitch is the same as 1342.

Like this normal TDC 1342
90 out 3421
180 out 4213
270 out 2134
back to 360 1342

 

all sorted now thanks for all the help

 

nice to see you about 2day carls9941
also he is still thinking about selling the 3door

 

ok mate good..... i have found my old 4x4 plastic header tank in shed its got 2 holes if u want it for ur motar as i have no use for it anymore also got some spare samco hoses in blue u got number give us a bell wen u want it and ill meet up wiv ya glad to see u got car sort .......... cossys guaranteed to f*** ur day up but you gotta love em