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20-09-13, 06:40 PM | #1 | |
Grown up member
Classic Audi Club Member
Join Date: Sep 2013
Location: Stroud, Gloucestershire
Posts: 190
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2.8 AAH Tappetts
Well, I've bought this 100E and had the cambelt done plus oil and filters.
The engine was fine up to this point other than a bit of rattle upon starting cold. Oil was replaced with 10-40 as per what was already in it with a Mahle filter. Engine became quite 'tappetty' and generally wouldn't shut up. Put some Wynns treatment in..... no improvement. Today, did a Flush, replaced filter with a VAG one and oil with 15-40 working on the basis that the thicker stuff may pad it out a bit. Result...... sounds like a London taxi. Any thoughts, bearing in mind it was quiet and now it aint! Alan |
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20-09-13, 06:50 PM | #2 |
4 ring whore!
Join Date: Jun 2008
Location: Rucava, Latvija
Posts: 3,816
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Well, since you put that 15w40 crap in, we have no reason to think that oil is too thin, so the most likely reason is too low oil pressure and maybe worn out tappets. Do you have oil pressure gauge in instrument cluster? If yes, how much does it reads when engine is hot?
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20-09-13, 07:03 PM | #3 |
Grown up member
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Join Date: Sep 2013
Location: Stroud, Gloucestershire
Posts: 190
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Oil pressure is 4bar cold and 2bar hot just as before. Thinking about it, it's probably a bit lower with the new oil than the old stuff but only by a fraction.
Alan |
20-09-13, 07:26 PM | #4 |
Trickster
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Join Date: May 2009
Location: Heckling from the cheap seats, Phnom Penh, KoW
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Does it sound like all tappets, or is it just very noisy for 1 or 2?
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20-09-13, 08:11 PM | #5 |
making wooden things
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Join Date: Dec 2009
Location: cow land
Posts: 8,154
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Looks like there's some kind of pressure control valve next to the second cam lobe if that makes any sense? People/google says it gunks up, it limits oil pressure to the lifters at 2.7 odd bar when it's not gunked up. Worth a look maybe. There are anti drain back valves too but these are just to keep the tappets full on start up.
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20-09-13, 08:37 PM | #6 | |
Grown up member
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Join Date: Sep 2013
Location: Stroud, Gloucestershire
Posts: 190
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Quote:
I may dump the oil for 10-40. Alan |
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20-09-13, 08:39 PM | #7 | |
Grown up member
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Join Date: Sep 2013
Location: Stroud, Gloucestershire
Posts: 190
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Quote:
Alan |
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02-10-13, 10:18 AM | #8 |
Grown up member
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Join Date: Sep 2013
Location: Stroud, Gloucestershire
Posts: 190
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Changed the oil to 5w40 fully synthetic. Made a very slight improvement. Yesterday, changed the pressure relief valves in the cylinder head. Upon start up, engine went quiet very quickly but the tappett noise came back after a few minutes. Took it for a drive and when I stopped there was no noise, but left it at idle for a bit and it came back.
This morning I started it and after a few seconds of 'tick' it went quiet. Left it at idle for maybe 5 minutes or more and as the pressure dropped/ temperature went up so the ticking started. Drove it around the block and again when stopped it was quiet for a bit. All very strange! Alan |
25-11-13, 02:24 PM | #9 |
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Join Date: Sep 2013
Location: Stroud, Gloucestershire
Posts: 190
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The saga continues!
Took advice from Audi and replaced the tappetts. Sourced some decent after-market ones for £130 and had my garage fit them as I didn't have the required tools (or the precise knowledge) to do the job myself. Result: No change whatsoever! So, after reading many online reports of replacing the oil check valves in the top of the block to solve such a problem I decided on this avenue. It took several weeks to get the valves due to issues with the Audi ordering system (part number 078 103 175D to those interested) and last week I set about doing the job myself to save some money. I sourced an 'idiot sheet' off 12v.org to do the job and it seemed straightforwrd enough. The check valves I took out look different to the new ones and also seemed to be working just fine, but put the new ones in anyway. Stuck it all back together and ........ no difference! Does anyone have any ideas whatsoever as to what could be causing this! I'm at my wits-end with this and am just as liable to weigh this POS in unless I get it sorted soon! Photos of the valves and the (f'kin useless) engine apart: Alan |
25-11-13, 03:32 PM | #10 |
Grown up member
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Join Date: May 2011
Location: Buxton
Posts: 745
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Not sure if it's relevant on this engine, but I have read a thread about loose oil suction pipe in the sump creating rattly tappets.
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