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Post by turbobones on Apr 22, 2022 14:22:43 GMT
Hi all, first real post on here looking for advice as I'm a little stuck for an answer. Engine sounds like I've damaged a tappet, was going around a roundabout and changed from 3rd to 2nd only to then hear a rattling tappet from the top end. Defo doesn't sound like engine damage as I drove it about 3 miles home and ran fine, oil pressure didn't move and didn't get any worse!
Car is a modified 1.8 turbo. Stripped the top off and all looks ok so I'm now wondering if its internal damage to a tappet as they all look clean & move freely. Next is to remove the cams and take out the buckets for a quick look over for damage. I have a spare engine which after taking the top off I've noticed its a 1.8 NA engine as the tappets are the hydraulic ones.
Questions I have is can I install the hydraulic ones into the NB engine? Or do people advise to stick with the solid bucket & shim type? As the car is a turbo does anyone have any advice on any particular tappets I can use or just stick with the original Mazda ones?
Thanks in advance
Bones
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Post by dickie on Apr 22, 2022 18:46:57 GMT
Has it spat a shim out ?
The cams should not be run without the correct followers for them so fitting hydraulic followers in a late engine is a bad idea unless you swap the cams too.
Its all to to with ramp lash clearances etc.
Check your oil level as hard cornering with low oil can lead to oil starvation and rattles.
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Post by atlex on Apr 22, 2022 21:48:30 GMT
Get some RTV for putting it back together so it doesn't leak. You *may* want to change the gasket at the same time. Also record some sound  so we can listen to the lovely noise. and/or do some analysis. |
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Post by atlex on Apr 22, 2022 21:51:36 GMT
You may want to idle the engine without the camcover on to see where the noise is really coming from, too... :-)
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Post by warpspeed on Apr 23, 2022 4:52:57 GMT
Get a length of plastic garden hose,stick one end in one ear, and go poking around with the other end to find out which tappet is making the noise. Take a really close look at that tappet, the valve spring and the shim.
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Post by turbobones on Apr 27, 2022 15:41:42 GMT
Thanks guys  Unfortunately no video of the sound as I started to take the top end apart almost immediately as I wanted to know the fault! Everything looks fine, buckets & shims all look shiny & clean, valve springs look fine. It defo sounds like a tappet noise albeit very loud & nothing else major but if I can't find an issue at this stage then it might be a head off job to check nothing else is broken. If I do this I might as well have a look at a small rebuild  I will keep taking things apart! Didn't want to drive the car or go to shows this year anyway!!  |
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Post by turbobones on Apr 27, 2022 15:43:37 GMT
Has it spat a shim out ? The cams should not be run without the correct followers for them so fitting hydraulic followers in a late engine is a bad idea unless you swap the cams too. Its all to to with ramp lash clearances etc. Check your oil level as hard cornering with low oil can lead to oil starvation and rattles. Shims all in place, nothing looks damaged and measured the clearances and all within the recommended tolerance. So are you saying I can put the hydraulic tappets into the current engine as long as I fit the cams the tappets came out of? |
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Post by dickie on Apr 27, 2022 16:05:39 GMT
Hi.
It should be possible, as far as I am aware the oil drillings for the followers are the same on all the BP based engines.
I suspect that the followers are not the real culprit.
(I should have a complete spare set of Mk2 1.8 followers and shims from my conversion to SUBs, And a set from a VVT head that I scrapped )
Have you done a compression test?
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Post by turbobones on Apr 27, 2022 16:25:08 GMT
Hi. It should be possible, as far as I am aware the oil drillings for the followers are the same on all the BP based engines. I suspect that the followers are not the real culprit. (I should have a complete spare set of Mk2 1.8 followers and shims from my conversion to SUBs, And a set from a VVT head that I scrapped ) Have you done a compression test? Cool, so in your opinion would you go with HLA or stay with the solid lifters? That is of course my solid lifters are not damaged! And when/if fitting the HLA's I need to fit the cams that was on the engine with the HLA's? The spare engine I have has a BP head with HLA's in it so was thinking of just doing a straight swop of cams and lifters. I still have a feeling it's something else and not a lifter, but what the issue is I have no idea yet! Haven't done a compression test yet and if I'm honest I hadn't given it a thought as I was hoping just popping the top off the engine would solve my problems but now I'm getting deeper into th engine then it might be worth doing 1 |
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Post by dickie on Apr 27, 2022 17:01:11 GMT
Pull the plugs and have a good look at them too.
I would stay with the shimmed lifters assuming you have not raised the rev limit by much.
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Post by turbobones on Apr 27, 2022 17:05:05 GMT
What's confusing me with this current issue is when the noise started I drove the car home which was about 5 miles, car was smooth, oil pressure was perfect, didn't stall or smoke just made a "noisey tappet" sound. I've dropped the oil & put new oil and a filter on it, started it and it still ticked its tits off! So its in bits now and searching for some sort of issue I can see, hopefully!
Real noob question but what are SUB's?
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Post by turbobones on Apr 27, 2022 17:07:52 GMT
Pull the plugs and have a good look at them too. I would stay with the shimmed lifters assuming you have not raised the rev limit by much. Plugs look fine & normal. Rev limit has not been played with too much just to protect the engine as its got 139k on it and don't want to put it under any unnecessary pressure when I don't need to. |
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Post by dickie on Apr 27, 2022 18:25:47 GMT
SUBs are Shim Under Bucket.
This means that the adjustment is done by cup shims between the valve stem and the follower. This set up will take 9000 RPM.
The Mk2 and Mk2.5 shims are between the follower and the camshaft which is fine until a drastic rev limit increase is used or high lift camshafts or both.
The SUB set up means special followers are used. ( Mine are Genuine Mazdaspeed ones ) I am using an 8000 Rpm limit with high lift cams.
SUBs are not normally needed for Turbo / Supercharged engines as they get all the power at lower revs.
I hope you find the answer to your engine problem is a simple one.
Its impossible to guess what it is without actually hearing the noise.
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Post by warpspeed on Apr 27, 2022 19:13:37 GMT
Agree, pin pointing the source of the noise is the key to this.
At this stage as there is still nothing really obvious, I think I would put it all back together and try to nail down the source, using the garden hose trick.
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Post by Zed. on Apr 27, 2022 19:48:36 GMT
using the garden hose trick. can be a bit drastic? surely the noise isn't that bad  Rich. |
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so we can listen to the lovely noise. and/or do some analysis.
I will keep taking things apart! Didn't want to drive the car or go to shows this year anyway!! 
le sigh