Thread: V8 3.9 compression test, Question to those in the know

Theres no way around it pull the head off, you will have a split/cracked valve and a stuffed head gasket
bet you all the tea in china..

T

Originally Posted by sclarke

What i have found out is the car last ran 1 month ago.. so it wont be stuck lifters....

Cam seems to be ok as all the rockers move about the same amount....

I'm going to do a pressure test as i have a plug adaptor for when i used to do valve stem seals on the rally car with the head on...

If it is a buggered piston i might just have to find a few $k and build a 4.6........

Have you got the head off yet, or found the problem, would be interested to hear, Regards Frank.

Originally Posted by Tank

Have you got the head off yet, or found the problem, would be interested to hear, Regards Frank.

Not yet....... got other crap to do 1st.....

might just put a 2.25 petrol in it.....

You want to buy a 50k on rebuilt 3.9? for 1k, I know where one is, I'm umming and arring about buying the wreck as its pricey....its got carbs on it

Originally Posted by rovercare

You want to buy a 50k on rebuilt 3.9? for 1k, I know where one is, I'm umming and arring about buying the wreck as its pricey....its got carbs on it

If i knew it was not going to shiet its self then i might......



Ohh the problem was the head gasket...

Pulled the rocker cover and rocker gear off and pressurised the bore, then i saw oil squirting from next to the push rods... 1st thought was a cracked block...
Then i looked further.... the oil was the oil i used to wet test the engine... and either the head is routed or the gasket is really blown bad....

i'm pulling the lot out tommorow.... and i'm going to make a new post on how to pull an engine out the rough way.....

Gas axe the front off the Disco

Originally Posted by sclarke

If i knew it was not going to shiet its self then i might......



Ohh the problem was the head gasket...

Pulled the rocker cover and rocker gear off and pressurised the bore, then i saw oil squirting from next to the push rods... 1st thought was a cracked block...
Then i looked further.... the oil was the oil i used to wet test the engine... and either the head is routed or the gasket is really blown bad....

i'm pulling the lot out tommorow.... and i'm going to make a new post on how to pull an engine out the rough way.....

Gas axe the front off the Disco

Why bother gas axe the front off just lop all the body bolts off and lift the body off first then you have a mobile engin stand

Originally Posted by lokka

Why bother gas axe the front off just lop all the body bolts off and lift the body off first then you have a mobile engin stand

Thats the ticket.......... might just do that.... then i dont have to pull the lot out yet, i can park the rolling chassis out on the lawn...

Originally Posted by sclarke

Thats the ticket.......... might just do that.... then i dont have to pull the lot out yet, i can park the rolling chassis out on the lawn...

You could do a re ring and hone without even taking the engin off the box just take off the sump undo all the rods and lift em out leave the crank in give it a hone fit new rings and big end bearings and put it all back together with new head gaskets then run it in the chasis would only cost a few hung and youd have a nice tight engin again