Author Topic: Noisy tappets - how bad can it be ?  (Read 1491 times)

carrera

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Re: Noisy tappets - how bad can it be ?
« Reply #30 on: 27 September 2019, 09:40:54 PM »
Thanks- that makes sense about the breather delivering oil mist to the cobra intake.

So, I'll park the smoky turbo and exhaust studs for later. Time to whip the cams off again (see how I said whip the cams off, easy now) remove the tappets, measure them up, check the internal camcover bolt holes are clear for oil, then reprime the tappets.

Any other ideas ?
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sgould

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Re: Noisy tappets - how bad can it be ?
« Reply #31 on: 27 September 2019, 10:12:09 PM »
The white non-return valve behind the top of the engine is working correctly?  I thought mine was OK but I wasn't blowing hard enough.  It was letting air by a bit.  So the turbo pressure was pushing more oil mist through.
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carrera

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Re: Noisy tappets - how bad can it be ?
« Reply #32 on: 27 September 2019, 10:20:10 PM »
The one way valve is broken on the right hand side.

It was sucking quite hard until I pushed the valve and pipe together and that quietened it down. I suppose I should check the valve and make a temporary repair

 
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fka

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Re: Noisy tappets - how bad can it be ?
« Reply #33 on: 28 September 2019, 12:42:59 PM »
The turbo itself ?

There was a little axial play, difficult to detect at first, but definitely there. There was fresh oil visible around the turbo inlet and on a few of the turbine blades.  From a quick look around it seems that the DE cars have different turbos too ?


I think a little radial play is normal, the oil pressure on the bearing takes up the slack when it running. You sure it's axial play you're feeling, it's quite difficult to gauge with the tbo in situ. If you'd expected the bearings to be shot and passing oil, wouldn't you find residue in the delivery pipe? Video showing the play on my current tbo below, blades don't touch the housing.

https://www.dropbox.com/s/g5j88gvkoinlxkc/20180909_135753.mp4?dl=0

Tbo is essentially the same as earlier models but has a 'short nose' compressor housing. Mitsubishi part number 49189-01850
And the larger cobra is a proper monkey puzzle, I've managed to get it in and out, after many swears, by slackening off the actuator bolts..

carrera

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Re: Noisy tappets - how bad can it be ?
« Reply #34 on: 28 September 2019, 02:12:51 PM »
Doh

Thought about it, identified radial play, wrote axial play  :-[

The play on mine is pretty much as your video, so perhaps not smoke from the turbo. It is chucking quite a bit out and consistently. I was perhaps hoping that the smoke was just the turbo, but perhaps not.

I'm glad I wasn't being a numpty in trying to get that cobra pipe off,and upon reassembly I found out I could get to the lower bolt from the underside with the engine cover off. Am I right in thinking that the difference is that the inlet is 5cm on the earlier cars and 6cm on the DE cars. Is that where the extra 10hp comes from and is this the same turbo that was fitted to the 9000Aero ?

The valve cover is off again, before I removed the exhaust cam I removed one by one the inside camshaft cap bolts around cylinders 2-4, plugs out. In each case it took a couple of seconds and then I could see the oil coming up the gallery. I took that as confirmation that the tappets would also be getting oil.

The exhaust tappets have been removed from3 and 4 again and the micrometer used.

The tappets seem to be in the 32.95 - 32.97mm range,but they seem to be worn at the top and bottom as you can see in the photo,indication of a little rocking?  The spec is 32.959 to32.975mm

I would say that the tappets are pumped up hard, so the sump drop and fresh oil seems to have made a difference.

The tappet bores are suppose to be 33.00 -33.016mm. They are quite difficult to measure, with vernier calipers, I think they were OK,but will recheck.

I'm now thinking that the tappets themselves are worn.Would that cause them not to pump up fully giving noise, or cause the tappets to rock in the bores with each reversal causing a knock. From simply removing /inserting them I would say they feel fine  ::)

???
« Last Edit: 28 September 2019, 02:17:36 PM by carrera »
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fka

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Re: Noisy tappets - how bad can it be ?
« Reply #35 on: 28 September 2019, 02:45:23 PM »
if you mean the exhaust housing then no, the stock DE is still a 5cm^3 exhaust housing. I've actually fit a 6cm^3 housing from a 9000 to mine but it doesn't offer any increase in bhp, just means it flows a little better and doesn't run out of puff as soon as the 5cm housing, at the expense of a bit more lag. I think the 'king cobra' is just less restrictive at the 90 degree bend, the inlet is the same size.

sgould

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Re: Noisy tappets - how bad can it be ?
« Reply #36 on: 28 September 2019, 03:28:44 PM »
The exhaust side is the same for all petrol 4 cylinder cars.  When I got the Hirsch 3 inch downpipe fitted, the old pipe was fitted to a 2000 2.0t.

The inlet is ,sort of "smoothed out" as far as I can find out.  I understand that an early turbo will fit if the entry flange is machined to suit. 
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carrera

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Re: Noisy tappets - how bad can it be ?
« Reply #37 on: 28 September 2019, 05:36:28 PM »
I was talking about the inlet side, where the cobra connects to.

I started searching for replacement turbos and in the process found out that the DE ones were different, though both are described as TD04HL-15T

Then reading this https://www.saabnet.com/tsn/bb/9000/index.html?bID=278469 I got more confused  ::)
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fka

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Re: Noisy tappets - how bad can it be ?
« Reply #38 on: 28 September 2019, 11:55:44 PM »
The exhaust side is the same for all petrol 4 cylinder cars.  When I got the Hirsch 3 inch downpipe fitted, the old pipe was fitted to a 2000 2.0t.

Yes the outlet of the exhaust housing is the same but the inlet [to the exhaust housing] from the manifold is 6cm^3 on the 9000 TD04-15T and 5cm^3 on the 9-3 and 9-5. The outlet on the manifold for the 9000 [with a TD04] reflects this, it's oval not round.

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Re: Noisy tappets - how bad can it be ?
« Reply #39 on: 29 September 2019, 12:06:39 AM »
I was talking about the inlet side, where the cobra connects to.

I started searching for replacement turbos and in the process found out that the DE ones were different, though both are described as TD04HL-15T

Then reading this https://www.saabnet.com/tsn/bb/9000/index.html?bID=278469 I got more confused  ::)

Yes the TD04 on the 9000 is clocked differently to the the 9-3 and 9-5. There's a small peg on the exhaust housing that marries with a hole on the turbo cartridge (or vice versa, can't remember exactly). To clock a TD04 from a 9000 for a 9-3 or 9-5, that peg needs to be removed and the exhaust housing rotated accordingly, before the v-band, holding the housing to the cartridge, is tightened.
The Mitsubishi part number I've noted above is the correct turbo for the DE 9-5's, having the 'short nosed' compressor housing...