evo 4

[leo]

hi can crank stay in wen you change inturnals on 4 engine can you just up rate pistons and con rods is the crank if good up to the job? thanks

 

[Marty.H]

This will all depend on the condition of your bores and crank journals i have in the past on other vehicles just removed the head and sump and protected the crank and honed the bores to bust the glaze and fitted new pistons rods and bearings.

But doing the above you MUST make sure its all very clean before fitting the bearings and new parts as any debris will result in failure.

But ultimately its all down to the condition of your bores and crank journals. Some bores may look round but are infact oval and new rings will not seal correctly on them and then you will have to remove the block and have a 0.5 overbore done to correct the bores and i personally always have the block face re-faced. Also when fitting the pistons pay attention to ring gaps and ALWAYS gap the rings per bore as you will get very minimal machining intolerance so if you gap 3 rings for cylinder one they need to be fitted to cylinder 1 piston.

If you are spending good money on internals i would recommend removing the engine and building the unit that way you can plastiguage the crank and check all clearances and any problems there can then be rectified with either a regrind ( which im not keen on ) or a replacement crankshaft

Hope that helps

 

[jay2k6]

Pistons and rods can be changed with the crank still in, heads do have to come off. Crank is ok on IV for 340 but can get crank walk, which is a 50/50 chance if doing more mods would fit Evo VIII crank with rods and pistons would be better.

 

[leo]

thanks lads for the replies wot i think i will do is keep the four as is and get viii engine in time i am asking thease questions cus i have this annoying ticking and trying to eliminat things and next step is head of do not know wot i will find yet i just thought it would be a chance to up rate inturnals but will not know wich way to go yet till i find wot the ticking is
this is wot bin done [lash ajusters new] [big ends checked] [balaced shafts removed] [compresion test done 150/150/140/140][camera down bores all seem fine][checked for crank walk none][swoped lash ajusters around to see if noise moves] i have been told it is prob somthing to do with head as the tick is too fast for gugeon pins and crank i will get to bottom of this :wtf: thanks for all the help i have recived from you all

 

[Marty.H]

Have you tried listening to the engine with a stethoscope ?

 

[leo]

well not a scope but screw driver on left hand bottom bolt on cam cover you can feel the tap on top of bolt

 

[Marty.H]

Have you checked the cam profiles for damage

 

[leo]

yes all good thay were checked wen the lifters went in i have been scratching my head for to weeks but there is no power loss just noise and at tick over you can not here it unless you now its there very very slight:ninja:thats how quiet it is on tick over

 

[Marty.H]

Did you bleed the new lash adjusters befor fitting them ?

 

[leo]

thay come prea filled with oil i was told to put them in full of oil

 

[Marty.H]

thay come prea filled with oil i was told to put them in full of oil

No i would pop them out and bleed them of by putting a paperclip down the middle and before you go to remove them test to see if there is any you can push down easy with your finger if you can it will need replacing ( even new parts can sometimes fail ) it will be rattly on initial start up but will quieten down

 

[leo]

yes i have checked them i do know wot you mean i have always put lash adjusters in with no oil in them wen i have rebuilt v8 engines and striped cars down to change cylinder head gaskets i have never had them primed but all people who i have spoken to about evo engines say prime first with not been familiar with evo engines i did wot i was told for once lol:hm:

 

[Marty.H]

If you do a google and have a poke about there is loads of info out there i would recommend trying it you don't have anything to loose

 

[leo]

ok i will do that your right. i have tried almost all i can think of thanks

 

[Marty.H]

Best of luck let us know how you get on

 

[leo]

oh i will wen i find out wot it is i will post it up in the biggest letters allowed lol thanks for your help m8

 

[SouthwestEvo]

Nice evo mate, alotta peiple seem to have the evo 4, even me!!

 

[leo]

hi found out today alls i can say is piston slap

 

[leo]

P**t Now Need New Engine

 

[Marty.H]

You sure the internals are 100% standard as piston slap can occur on some aftermarket pistons


Also may sound silly but are the injectors nice and quiet as some injectors can be very noisy