Hi,
Escort has become very tappety low down. Can someone confirm the correct clearance (follower-cam) for bp300 cam? Found a thread for BP285 stating 0.35mm (0.014") for all valves. Also is it best to measure the clearance when cam is exactly 12:00 when the lobe is pointing directly up?
Thanks
Allan
Well I thought 0.014" was large.. I was think more along the lines of .010" Inlet and .012" Exhaust.Originally Posted by Allanscort
Then I thought just look up Piper cams site and I found this
https://www.pipercams.co.uk/Camshaft...ne-SOHC-PINTO/
Bp300 is about half way down the page which says .008" Inlet .010" Exhaust.
You should have a look at this too as there is a few other reasons it could be tappety.
http://www.turbosport.co.uk/showthread.php?t=349340
8 and 10thou is the clearance setting ive always used.
Hi,
Many thanks, I searched online but obviously not well enough! I read that thread, will check out wear on the followers. it was quiet after the garage adjusted it few months ago now noisy again so was assuming/hoping that it had maybe lost adjustment as I read on a thread that it seems to be common for them to loosen off.
Maybe silly question sorry...I have only adjusted the clearances on my old Chevette, using rule of 9. I have the manual for crossflow engine not the pinto fitted. How do you know what is Inlet /Exhaust?
And I gather a bit of rtv sealant between the gasket and cover is all that is needed? Garage put some on the block unless it has seeped through.
Procedure coming back to me now, I should manage, been a while since I done them on the Chevette.
As far as I know, as long as the cam lobe is pointing straight up so the follower is loose you adjust it there. The inlet is on the carb side of the engine exhaust is on the other side, so as you're looking at it in the engine bay inlet on the right exhaust on the left.
This thread should help too.
http://www.turbosport.co.uk/showthread.php?t=120837
the inlet valves are on the carb side, but the adjusters for the inlets are exhaust side. as above no need for rule of thumb, just turn the engin eso which ever valve you are going to do has the cam lobe pointing up
Cheers for the help, I'll have a go at it tonight.
Yea apologies I forgot to mention that bit..
Had a go last night, adjust two of the inlets. It's a finicky process! Think I'll need a smaller length of spanner or shaped one for the locknuts on the carb side, any idea where to buy one? The clearance on the ones I have checked so far did seem a bit out, bigger gap. Not going to bother removing the followers to check wear as it was a new build last year. My biggest concern is getting the cover to seal when refitting, new gasket and rtv sealant on order. Read the procedure for fitting it, stick gasket to cover only, fit all bolts ensuring gasket holes are lined up with tightening the tower bolts last.
I’ve always used 8 & 10 thou but the Newman cam I’m using has 6 & 8 thou specified.
It is a fidly job but I bought some feeler gauges that have a 45 degreee bend towards the end & they are as wide as the follower pad. Makes it so much easier when the feeler gauge is same width as the lobe/pad being measured because the follower can otherwise move around a bit.
Can’t remember where I got them but designed specifically for tappets
Bend and old spanner in the vice to fit the lock nuts.
I've got the most of them set, should just have bought and bent an old spanner but purchased some crows feet on ebay to use with 3/8" drive. Try that on the 2 rear exhaust ones later.
Question: The 2nd inlet seem to need lifted quite a bit to meet the 0.08" clearance (See pic) Is this is issue? or is it fine? Does this indicate excessive wear in the follower? Haven't popped it out to check, maybe should.
The adjusters do come loose so it could have unwound itself a little. But IMO I'd pull the follower out an have a look at it...
Thanks Rob, I'll pull the follower tonight and post a pic. I'm just a bit concerned if it is near the end of the thread it could rattle out. It's further screwed out than all the rest.
That in itself could be an indication of the follower being worn. I'd ask myself Why is it wound out so much... I had a set of chocolate followers years ago that also ate one of the camshaft lobes.... That was a similar situation in that the follower was wound out further
than the rest...
Yeah, same thinking. Best remove it later and take a closer look, cheers.
Ordered gasket off Ebay which has got lost in the post! So ordered 2 off from Burton Power yesterday. I should have added a couple of followers, didn't realise they were so cheap! Typical! More time off the road if it needs a follower now.
Last edited by Allanscort; 13-09-2018 at 16:21.
So adjusted the rest of the lifters, crows feet worked no too bad, creates a twisting action so need to be careful it doesn't round nut. Popped off suspect follower, opinion? Can't get any of the others off, this one came out easy.
Post a pic tomorrow on computer, probably can't load it off my phone.
followers come out easily, but only when cam lobe is pointing up, just use a hammer and tap the adjuster end to knock it towards the valve, you can do the opposite to refit
Cheers Graham, I see now, had a quick go again this morning, popped out another to compare, its for scrap!!! I'll check them all for wear.
Easy when you know how! Popped them all out in ten mins, just seems to be this one that is completely worn!
ouch ! thats as bad as they comeget a pic of cam lobe.
I know, nasty! Profile is complete opposite! And not much meat left! Don't like to think what would have happened if I had left it much longer, eek!
Lobe looked okay I think...you can see it a bit in the pic further up the thread but will get a proper pic later.
What do folks recommend? just replacing this worn follower or doing them all? Rest don't look bad but I've not got a new one for a closer comparison.
Bit of Googling there, I think the others show minimal wear in comparison to new. Funny how this single one has worn as bad! Guess it must have slackened off and taken a beating!
Is there anything else underlying I should be concerned about that could cause the follower to wear as bad?
Maybe remove the distributor and attach a 6mm socket to a cordless drill. Spin the drill over and check that you have oil coming out of your spray bar above this lobe.
Last edited by dt36; 14-09-2018 at 12:03.
just take the plugs out and spin it over on the starter and look for oil
Holes all look clear, spray bar in perfect condition. The plugs are out already, I'll get my dad to spin it over later, cheers again!
Ouch, Yea that's proper bad... Looks worse than mine ever did....
with regards to the others, as new they are a gentle curve - "normal" wear will show as a narrow line or flat across the curve, if its an obvious dip then change it
I'd be worried pal about where the rest of the follower is check oil asap hopefully not done too much damage
Yip indeed! I'll drop the oil, it was running fine before just rattly. Spun engine over, spray bar is fine, oil coming out all holes. Lobe looks to be okay eh? Don't see any difference visually.
I’d be checking your rocker geometry, hard to tell from the photos but that wear looks like pressure wear rather than lack of lubrication, I’d expect some blue - heat build up if there was no oil spraying onto the lobe / follower
You think? Not so good! I was hoping it was maybe just out of setting, don't have the kit or expertise to check geometry. Need to think.
Funny because I was starting to think along the same lines, that maybe the geometry is wrong.
im going to be controversial here! theres a lot of bollocks written about rocker geometry wearing things out!
i cant tell you how many cams i have fitted, to date ive never had one wear out, if you get roughly the valve lift you are supposed to and the cam doesnt wipe off the end of the follower the geometry is good enough.
Last edited by Graham; 15-09-2018 at 08:33.
Unless the geometry is so far off that the cam to follower pressure is massively increase around full lift as the valve spring is almost fully compressed, I’ve seen that a few times, especially if the follower pad is of a lower hardness that the cam lobe.
that's a somewhat different case, in that case the valve lift will be way off spec, and possibly the spring are wrong or installed height all wrong, i actually check that spring pressure at full lift isnt excessive
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