Ok I have had them out and pulled apart, cleaned out. Back in car and still noisy, Can you still buy new ones for a mazda bp engine! cheers
motig,
Apr 29, 7:17pm
I vaguely remember my old holden had them. Dont you tighten them down till engine runs rough then back of a half turn or something like that. (this was a long time ago mind, probably remembered it wrong)
quater,
Apr 29, 7:23pm
No adjustment in these puppies, just oil pressure. Have found people talking about some oil additive might give that a go. :(
you sure! 323 1.8 '94 to 98 BP engine, check and adjust valve clearances 1.3 hrs
quater,
Apr 29, 7:45pm
Oh sorry its pre 94
Im pretty sure have had it apart didn't see any addjustment, But willing to learn if you know how.
franc123,
Apr 29, 7:50pm
Something tells me they are shimmed lifters in those BP's, they're not hydraulics. You can't adjust them in the normal way.
skin1235,
Apr 29, 7:50pm
lol, I'm just quoting the book, they claim 1.3 hrs to adjust them, I've never even seen the cam arrangement to know if its rocker or bucket
quater,
Apr 29, 7:52pm
I just edited my post its pre 94, yes shimmed lifters, The engine has done maybe 10k on a new rebuild, I just want it to sound like it. Maybe different oil
hijacka,
Apr 29, 7:58pm
Bent valve.
skin1235,
Apr 29, 7:59pm
10k on a rebuild! , I'd want better than different oil to fix noisy lifters
are they shimmed to take the slack then operate via hydraulic! I'm guessing here but if so they will have quite a large tolerance to overshimming the old holden type scenario where you crank them down till it runs rough and wait, then crank them down another 1/4 turn, in your case shim them to no slap then add another shim - let the hydraulics do what they're designed for
quater,
Apr 29, 8:09pm
Its does go away mostly after it warms up, but new they wouldn't have been noisy on startup up. skin1235 I get what you are saying, But Im not sure how they are meant to work.
skin1235,
Apr 29, 8:10pm
pre 94 was a BPE, way back to '89, yes hydraulic valve train, yet they still claim 0.5 hrs to check and adjust thats going to be a swift method, it would take half of that just to get the covers off
skin1235,
Apr 29, 8:13pm
as I said before , I'm guessing, never had one open in front of me that I know of ( and I say that cos they fitted mazda engines in a lot of vehicles) I don't have an exploded view or a workshop manual for one either
but while we've been chatting someone may have come along that does know these beasts and how to shut the valve train up
quater,
Apr 29, 8:16pm
I been hunting google for a picture of them, I have seen one before but it must be the only one on google.
HLA = hydraulic lifter assembly where does the shim go
this is a single cam!, valves are below the cam shaft! not offset and have rockers that operate the HLA
quater,
Apr 29, 8:37pm
Its a dohc and the HLA sits under the cam and the piston in the HLA sits on the valve head. they are called so many things it does my head in.
skin1235,
Apr 29, 8:39pm
interesting your comment they shut up when warm sounds like they;re leaking down and taking a while to pump up again and with hydraulic lifters that is going to be varnish and grit internal
they take some serious cleaning, and need good clean oil = oil changes
used to use white spirits to clean the varnish on the hyd lifters I've done ( and sometimes had to clean them twice - pain in the proverbial fitting them just to find that 1 or 2 are still noisy)
and a right pain same place getting them apart
skin1235,
Apr 29, 8:42pm
got your last post BP dohc pre 93! okay, new on me, thought the dohc arrived in 94, pre 94 were BPE singles, no biggie, mazda weren't the most common ones in the shed
skin1235,
Apr 29, 8:44pm
multi valve! ie more than 2 per pot!
where does this shim sit
skin1235,
Apr 29, 8:46pm
whats the oil flow like to the cams, mazda had silly restricters on the head face at one time, possibly more, had to take the head off to clean them out a few times - but on engines that had been abused, ie 25k plus per oil change if at all
quater,
Apr 29, 8:47pm
89 was the start of the bp dohc its the 1800cc engines they also have the BPT and the BPD both the BPT and BPD are turbo. Mines the BPT
quater,
Apr 29, 8:50pm
shim aka HLA, oil seems good, Maybe too think at start up. 16 valve
skin1235,
Apr 29, 8:53pm
thats good to know, . lol retired and still learning
principal of hyd lifters was they were lash free when working correctly, they do have a max travel that was adjustable so that they worked inside the hyd travel, about the only thing that goes wrong with them is dirt upsetting the seal on the ball
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