scoobysmiff

iTrader: (2)

I have just put the cams back in the heads and i have noticed that there is a difference between how tight the cams are to turn when the cam caps are on?

On both heads, the inlet cams will turn nice and freely by hand but the ex cams i need to use a bit of effort to turn them, they can be done by hand but not half as easy as the inlets, is this normal or do i have issues to deal with regarding the ex cams?

scoobysmiff

iTrader: (2)

any engine builders out there that have experienced this?

Jolly Green Monster

iTrader: (4)

never noticed a difference but then turning against the springs etc.. have you lubed them?

Simon

Jolly Green Monster

iTrader: (4)

just checked on an engine here and no I can spin all the cams freely by hand between lobes pressuring the valves. but they are well lubed with oil.

Simon

FB Tuning

iTrader: (30)

They can sometimes feel a bit 'tight' if you're using a new cam seal.

Try rotating them with the seal removed to see if they are turning free.

R19KET

The caps aren't pinned, so it's possiblr to fit them slightly offset, even if you think they are straight.

Fit the caps one at a time, checking the cam is free. Sometimes you need to tap the cap forwards or backwards to centralise it. If you're not sure, take the cap off, and you will see a witness mark where it's rubbing.

Also, only use a VERY thin film of oil for checking, because thick assembley lube can lock the cam up.

Once you get them right, scribe the cap/head so you can refit them, and use the lube.

Mark.

scoobysmiff

iTrader: (2)

I have some very good quality contact oil which i have used a lot and its very good, i had labled the caps so i couldn't put them on them incorrectly either, i shall check them one at a time as you say and see what happens, cheers all.

avalaugh

it can only take 1 cap to be fitted the wrong way round or swapped with another for it to be tight

i by mistake fitted 1 cap on a GTO the wrong way round and that made the cam hard to turn, turned it round and all was fine

so make sure you sort this before you fire it up or it will seize

Jolly Green Monster

iTrader: (4)

expanding on what has been said.. the caps have markings for location and which way around they do.. I know you said you have marked them.. just check the original markings for which way around.

Simon

scoobysmiff

iTrader: (2)

i'm quite sure that i have the caps in the correct place, i drew on a bit of paper where they went and labeled the drawings with the cap numbers so that i didn't get it wrong, i will just have to have another look and see if i can see anything untoward!
Cheers for your help gents

scoobysmiff

iTrader: (2)

i'm quite sure that i have the caps in the correct place, i drew on a bit of paper where they went and labeled the drawings with the cap numbers and direction arrows so that i didn't get it wrong, i will just have to have another look and see if i can see anything untoward!
Cheers for your help gents

Jolly Green Monster

iTrader: (4)

they also have a direction as well as being in the right place.

Oh and you also need to silicone seal between cap and head on the front ones.

Simon

scoobysmiff

iTrader: (2)

i think i have sussed it!!! i said they needed to be reshimmed, well i checked how tight they are and the exhaust ones are tighter than .05mm and are i think, touching the cam lobe, these are the ones i had recut so would make sense that they are now too tight, doh!!!!!!