16 replies to this topic

[hillmanimpfan]

hi all,
at loss end been try to fix my 1975 austin allegro 1300 for its MOT and each time it breaks down on me i ve had simlar problem each time and i cant figure it out. keeps going throw headgaskets???
1. it overheats in traffic even on cold days in early april steam from top radiator ? changed radiator and termostat, all hoses no change. changed headgasket
2. this happened 3 weeks ago the oil boiled and went white on the oil cap. plus still overheating water boiling over . changed head gasket
3. managed to get it running again but running very rough maybe 3 cylinders and would go up any steephills lots of smoke???

changed headgasket and rehecoiled 2 studs and i am still left with same problem?? the engine done a geniune 40,000miles for new got all docoments to back it up but i seem be having engine trouble. can anyone give me some advise

Edited by hillmanimpfan, 08 May 2012 - 02:57 PM.

[surfblue63]

Is the head warped? Did you get it refaced when it first overheated?

[hillmanimpfan]

hi, yes it was skimmed i have now got a different head on it after the 2nd time but it not looking good

[Tommyboy12]

Have you changed the water pump? Pretty standard course when you change the headgasket from an overheat I would have thought.

[Sheikh Pip]

Or Flushed out the radiator?

[amarcd]

make sure you change the oil too, water in oil not good.

[sprag]

Is water circulating round the radiator- do the hoses get warm as the engine reaches normal temp when it first warms up?
If it only overheats when stationary is the rad fan cutting in properly ? Try shorting the fan thermostat wires to bring fan on constantly -think its on the end of the radiator with 2 spade terminals

[hillmanimpfan]

the fan operates fine just keeps boiling over lots bubbles and water pump is working fine, very confusing as its been flushed 3 times no change even if i keep the fan on i think will overheat

[Algordo1100]

Is your ignition timing correct?

Al

[03jkirk]

have you been retorquein the head properly after gettin the engine upto temp for the first time and after around 100 miles??

[sledgehammer]

is the block deck flat ? - in good condition ?

& what type of headgasket ?

& it may seem an obvious question - was the helicoil a bit below the block surface

(only takes a small bit to be proud of the surface)

Edited by sledgehammer, 08 May 2012 - 06:34 PM.

[Liam Mini 35]

is the thermostat working? are you loosing oil? have you got anti freeze in your coolant?

[sprag]

Is the thermostat in the correct place - should be between the heater outlet plate and the top hose outlet.
If its directly on the head you wont get any circulation untill it overheats as the heater pipes act as a bypass hose on the Allegro as far as I recall.

[hillmanimpfan]

i post a video up tomorrow see if you figure it out, i am in south nottingham area so if anyone in the area who could help me out i would grateful

[hillmanimpfan]

have you been retorquein the head properly after gettin the engine upto temp for the first time and after around 100 miles??

thought it was every 400 miles? in my manual it tell you this but nothing about the process ?