Extra “tappety’ noise to engine after re-build

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265bhp
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#1 Extra “tappety’ noise to engine after re-build

Post by 265bhp » Thu Oct 08, 2020 7:12 pm

Hi all

Having rebuilt my 3.8 engine and got it test running the other week all seemed good but there is an additional mild clattering/tappety sounding noise



I left it overnight, removed the cam covers and then measured the gaps, which were around 7/8 thou on the inlet and 8-9 thou on the outlet side...so around 3/4 thou over spec

I am waiting for a reply from the guy who built the head, but in the meantime wondered if you might have some thoughts as to what is making this noise (hopefully you can hear it) and if it could be anything else other than the gaps

Thanks
Jonathan
1963 3.8 FHC in slow restoration mode
1974 2.7 Carrera now as an RS Touring

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mgcjag
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#2 Re: Extra “tappety’ noise to engine after re-build

Post by mgcjag » Thu Oct 08, 2020 7:41 pm

Hi Jonathan....i cant hear anything unusual on the video. ....but thats probably just my tablet....another recent engine noise problem here...Steve http://forum.etypeuk.com/viewtopic.php? ... a0c78f069e
Steve
1969 S2 2+2 & Building a C type replica

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265bhp
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#3 Re: Extra “tappety’ noise to engine after re-build

Post by 265bhp » Thu Oct 08, 2020 8:26 pm

Hi Steve
What do you think about the clearances though...pretty well out of tolerance range...?
All the best
Jonathan
1963 3.8 FHC in slow restoration mode
1974 2.7 Carrera now as an RS Touring

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splosh
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#4 Re: Extra “tappety’ noise to engine after re-build

Post by splosh » Thu Oct 08, 2020 8:50 pm

IF the cams have been turned without the cam sprockets fitted with the chains on then possibly a bent valve.
It's quite an easy mistake for the unknown as the cams must be set and not rotated without being timed.
Clive
August 1961 Flat floor ots

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#5 Re: Extra “tappety’ noise to engine after re-build

Post by mgcjag » Thu Oct 08, 2020 9:09 pm

Hi Jonathan. ...i cant hear the noise from here....yes the gaps are out of spec......let us know what your engine builder has to say....when was it done......has the noise just started?.....Steve
Steve
1969 S2 2+2 & Building a C type replica

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#6 Re: Extra “tappety’ noise to engine after re-build

Post by 265bhp » Thu Oct 08, 2020 9:18 pm

Hi Steve
I am hopefully going to speak to him tomorrow
He did all the machine work and assembled the head, I did everything else

Engine was built up around 2 years ago and has sat waiting for me to build the car up around it

The first start up and short run around the lanes here was 2 weeks ago


Jonathan
1963 3.8 FHC in slow restoration mode
1974 2.7 Carrera now as an RS Touring

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#7 Re: Extra “tappety’ noise to engine after re-build

Post by mgcjag » Thu Oct 08, 2020 9:48 pm

Hi Jonathan....are you confident that you set up the valve timeing and chain tension correctly..and you do have plenty of oil in there......Steve
Steve
1969 S2 2+2 & Building a C type replica

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#8 Re: Extra “tappety’ noise to engine after re-build

Post by abowie » Thu Oct 08, 2020 9:54 pm

A tappet 3 thou over will be noisy. All of yours are well over, and the engine sounds like it.

Some people advocate setting clearances slightly loose (maybe one thou) based on the observation that newly cut seats may close up a little once the car is driven. Personally I'm not an advocate of this; when I set up heads for customer cars I aim to have the valves spot on 4 and 6. I have also done this on all of my own cars; they do not have tappet noise.

So were it my engine I'd redo the shims to set it up to factory.

If you haven't already done it, retighten the timing chain too.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
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#9 Re: Extra “tappety’ noise to engine after re-build

Post by Series1 Stu » Thu Oct 08, 2020 10:00 pm

Hi

It is noisy but it will quieten down quite a bit if you fit the air filter. I would say correcting the gaps will certainly help.

Is the engine fully warmed up?

Regards
Stuart

If you can't make it work, make it complicated!

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#10 Re: Extra “tappety’ noise to engine after re-build

Post by 265bhp » Fri Oct 09, 2020 2:43 pm

Thanks all

The engine was correctly filled with oil, but partially warmed

Mike (engine man) is coming over a week on Saturday so we will hopefully adjust and space within the day.. :bouncyyellow:

I’ll let you know

Best
Jonathan
1963 3.8 FHC in slow restoration mode
1974 2.7 Carrera now as an RS Touring

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#11 Re: Extra “tappety’ noise to engine after re-build

Post by christopher storey » Fri Oct 09, 2020 6:17 pm

I hate to say this, but that engine sounds to be firing on at best 5 cylinders and some of the time on 4 . Perhaps a longer video with the engine fully warmed up, and with the air silencer trunk replaced, would give a better guide

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#12 Re: Extra “tappety’ noise to engine after re-build

Post by Mich7920 » Fri Oct 09, 2020 9:06 pm

:yeahthat:
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
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265bhp
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#13 Re: Extra “tappety’ noise to engine after re-build

Post by 265bhp » Sat Oct 10, 2020 6:24 pm

If heat on the exhaust manifolds is an indicator that a cylinder is working fine then the engine was firing on all 6..it ran smoothly as we did a couple of short runs up and down the lane I live on

It’ll let you know once the gaps are re-set next week...as they are certainly not good as they are so it’s best to rule them out and see if any other noises remain

Best
J
1963 3.8 FHC in slow restoration mode
1974 2.7 Carrera now as an RS Touring

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