Tappet clearnace on TC (1949)

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frenchblatter
Posts: 14
Joined: Tue Apr 07, 2015 6:36 am

Tappet clearnace on TC (1949)

Post by frenchblatter » Sat Feb 17, 2018 1:21 pm

I'm sorry to bring this up again, I'm sure it was discussed some time ago. But my memory isn't what it used to be. What's the thinking of setting the tappets to 0.015" instead of 0.017" to stop the clatter.  I really hate valve clatter as it sounds like a poorly maintained engine. If the group thinks it's OK I'll set them to 15 thou whilst I have it in the workshop. Thanks, Norman Verona TC10178
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George Arber
Posts: 43
Joined: Mon Jan 15, 2001 12:03 pm

Fwd: [mg-tabc] Tappet clearnace on TC (1949)

Post by George Arber » Sun Feb 18, 2018 12:20 am

Begin forwarded message:
[b]From:[/b] George Arber george.arber@btinternet.com> [b]Date:[/b] 18 February 2018 at 08:19:28 GMT [b]To:[/b] norman@frenchblat.com [b]Subject:[/b] [b]Re: [mg-tabc] Tappet clearnace on TC (1949)[/b]
I always set mine to the original standard 0.019" hot.  Clatters yes but that is normal too.George On 17 Feb 2018, at 21:12, norman@frenchblat.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:   I'm sorry to bring this up again, I'm sure it was discussed some time ago. But my memory isn't what it used to be. What's the thinking of setting the tappets to 0.015" instead of 0.017" to stop the clatter.  I really hate valve clatter as it sounds like a poorly maintained engine. If the group thinks it's OK I'll set them to 15 thou whilst I have it in the workshop. Thanks, Norman Verona TC10178
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David James
Posts: 3
Joined: Wed Jun 01, 2016 12:21 pm

Re: Tappet clearnace on TC (1949)

Post by David James » Sun Feb 18, 2018 2:09 am

I had noticed play in the distributor shaft of my 1948 TC, along with quite a lot of oil in the distributor top, and thought this might be the cause of the noisy engine. So I replaced the bushes in the distributor body. This cured the oil problem, but not the clatter. So I used the method given on the MGCC Y-Type Register web site to determine that the camshaft was still of the type that required a 19thou tappet clearance. On the basis that there are indents on the rockers that my feeler gauge would not detect, I set the clearance to 17thou. It is still noisy, but I am reluctant to reduce the clearance further. David (TC4985)
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Norman Verona
Posts: 107
Joined: Sun May 17, 2015 4:21 am

Re: Tappet clearnace on TC (1949)

Post by Norman Verona » Sun Feb 18, 2018 3:01 am

David,

 

My clatter is from the tappets. The tappet faces are good (I ve fully rebuilt the engine) As far as I know it s a 0.017 camshaft.

 

I ll try reducing them to m0.015 and if the clatter is the same open them back up to 0.017 .

 

I don t over rev the engine, 4000 rpm is about as high as I take it. It s as standard as it can be apart from 0.040 oversize pistons from a rebore before I bought the car.

 

I don t need speed from this car, I have a manic Caterham with 220 BHP weighing 500 kgs. That s for the time I want to shake some cobwebs. Also my everyday car is a 189 bhp Lotus Elise. The TC is for driving sedately along country roads.

 

 

[b][i]Norman Verona[/i][/b]

11 Cherry Close, Royston, South Yorkshire S71 4LZ

Phone: 0044 (0)1226 728811

Mob: 0044 (0)741 9905 741

[b][i]Web: www.frenchblat.com[/i][/b]

 

[b]From:[/b] mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com] [b]On Behalf Of [/b]David James dr.david.james@gmail.com [mg-tabc] [b]Sent:[/b] 18 February 2018 10:10 [b]To:[/b] mg-tabc@yahoogroups.com [b]Subject:[/b] [mg-tabc] Re: Tappet clearnace on TC (1949)

 

 

I had noticed play in the distributor shaft of my 1948 TC, along with quite a lot of oil in the distributor top, and thought this might be the cause of the noisy engine. So I replaced the bushes in the distributor body. This cured the oil problem, but not the clatter. So I used the method given on the MGCC Y-Type Register web site to determine that the camshaft was still of the type that required a 19thou tappet clearance. On the basis that there are indents on the rockers that my feeler gauge would not detect, I set the clearance to 17thou. It is still noisy, but I am reluctant to reduce the clearance further. David (TC4985)

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Bill Hyatt
Posts: 78
Joined: Tue Nov 23, 2010 6:23 am

Re: Tappet clearnace on TC (1949)

Post by Bill Hyatt » Sun Feb 18, 2018 6:04 am

Guys, Clatter can also come from timing chain tensioner as it translates back and forth axially -Bill HyattSent from my iPhone
On Feb 18, 2018, at 6:01 AM, 'Norman Verona' norman@frenchblat.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:
  David,

 

My clatter is from the tappets. The tappet faces are good (I ve fully rebuilt the engine) As far as I know it s a 0.017 camshaft.

 

I ll try reducing them to m0.015 and if the clatter is the same open them back up to 0.017 .

 

I don t over rev the engine, 4000 rpm is about as high as I take it. It s as standard as it can be apart from 0.040 oversize pistons from a rebore before I bought the car.

 

I don t need speed from this car, I have a manic Caterham with 220 BHP weighing 500 kgs. That s for the time I want to shake some cobwebs. Also my everyday car is a 189 bhp Lotus Elise. The TC is for driving sedately along country roads.

 

 

[b][i]Norman Verona[/i][/b]

11 Cherry Close, Royston, South Yorkshire S71 4LZ

Phone: 0044 (0)1226 728811

Mob: 0044 (0)741 9905 741

[b][i]Web: www.frenchblat.com[/i][/b]

 

[b]From:[/b] mg-tabc@yahoogroups.com [mg-tabc@yahoogroups.com] [b]On Behalf Of [/b]David James dr.david.james@gmail.com [mg-tabc] [b]Sent:[/b] 18 February 2018 10:10 [b]To:[/b] mg-tabc@yahoogroups.com [b]Subject:[/b] [mg-tabc] Re: Tappet clearnace on TC (1949)

 

 

I had noticed play in the distributor shaft of my 1948 TC, along with quite a lot of oil in the distributor top, and thought this might be the cause of the noisy engine. So I replaced the bushes in the distributor body. This cured the oil problem, but not the clatter. So I used the method given on the MGCC Y-Type Register web site to determine that the camshaft was still of the type that required a 19thou tappet clearance. On the basis that there are indents on the rockers that my feeler gauge would not detect, I set the clearance to 17thou. It is still noisy, but I am reluctant to reduce the clearance further. David (TC4985)

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tim_jackson_tc0999
Posts: 6
Joined: Thu Dec 19, 2013 7:21 am

Re: Tappet clearnace on TC (1949)

Post by tim_jackson_tc0999 » Sun Feb 18, 2018 6:30 am

I d stick with the camshaft spec for valve clearance, and accept the tappet clatter.  Unusually quiet would worry me.

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Peter Lund
Posts: 10
Joined: Sat Sep 01, 2007 8:16 pm

Re: Tappet clearnace on TC (1949)

Post by Peter Lund » Sun Feb 18, 2018 2:19 pm

Can also be worn rocker shaft or rocker arms!  Sent from Yahoo Mail for iPhone
On Sunday, February 18, 2018, 6:04 AM, Bill Hyatt usaj24@earthlink.net [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:

  Guys, Clatter can also come from timing chain tensioner as it translates back and forth axially -Bill HyattSent from my iPhone On Feb 18, 2018, at 6:01 AM, 'Norman Verona' norman@frenchblat.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:   David,

 

My clatter is from the tappets. The tappet faces are good (I ve fully rebuilt the engine) As far as I know it s a 0.017 camshaft.

 

I ll try reducing them to m0.015 and if the clatter is the same open them back up to 0.017 .

 

I don t over rev the engine, 4000 rpm is about as high as I take it. It s as standard as it can be apart from 0.040 oversize pistons from a rebore before I bought the car.

 

I don t need speed from this car, I have a manic Caterham with 220 BHP weighing 500 kgs. That s for the time I want to shake some cobwebs. Also my everyday car is a 189 bhp Lotus Elise. The TC is for driving sedately along country roads.

 

 

[b][i]Norman Verona[/i][/b]

11 Cherry Close, Royston, South Yorkshire S71 4LZ

Phone: 0044 (0)1226 728811

Mob: 0044 (0)741 9905 741

[b][i]Web: www.frenchblat.com[/i][/b]

 

[b]From:[/b] mg-tabc@yahoogroups.com [mg-tabc@yahoogroups.com] [b]On Behalf Of [/b]David James dr.david.james@gmail.com [mg-tabc] [b]Sent:[/b] 18 February 2018 10:10 [b]To:[/b] mg-tabc@yahoogroups.com [b]Subject:[/b] [mg-tabc] Re: Tappet clearnace on TC (1949)

 

 

I had noticed play in the distributor shaft of my 1948 TC, along with quite a lot of oil in the distributor top, and thought this might be the cause of the noisy engine. So I replaced the bushes in the distributor body. This cured the oil problem, but not the clatter. So I used the method given on the MGCC Y-Type Register web site to determine that the camshaft was still of the type that required a 19thou tappet clearance. On the basis that there are indents on the rockers that my feeler gauge would not detect, I set the clearance to 17thou. It is still noisy, but I am reluctant to reduce the clearance further. David (TC4985)

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Norman Verona
Posts: 107
Joined: Sun May 17, 2015 4:21 am

Re: Tappet clearnace on TC (1949)

Post by Norman Verona » Sun Feb 18, 2018 2:38 pm

Peter,

 

New shaft and rockers rebushed.

 

 

[b][i]Norman Verona[/i][/b]

11 Cherry Close, Royston, South Yorkshire S71 4LZ

Phone: 0044 (0)1226 728811

Mob: 0044 (0)741 9905 741

[b][i]Web: www.frenchblat.com[/i][/b]

 

[b]From:[/b] Peter Lund [mailto:pgl@prodigy.net] [b]Sent:[/b] 18 February 2018 22:20 [b]To:[/b] Bill Hyatt usaj24@earthlink.net>; Norman Verona norman@frenchblat.com> [b]Cc:[/b] David James dr.david.james@gmail.com>; mg-tabc@yahoogroups.com [b]Subject:[/b] Re: [mg-tabc] Re: Tappet clearnace on TC (1949)

 

Can also be worn rocker shaft or rocker arms!  Sent from Yahoo Mail for iPhone

On Sunday, February 18, 2018, 6:04 AM, Bill Hyatt usaj24@earthlink.net [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:

 

Guys, Clatter can also come from timing chain tensioner as it translates back and forth axially

-Bill Hyatt

Sent from my iPhone

On Feb 18, 2018, at 6:01 AM, 'Norman Verona' norman@frenchblat.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:

 

David,

 

My clatter is from the tappets. The tappet faces are good (I ve fully rebuilt the engine) As far as I know it s a 0.017 camshaft.

 

I ll try reducing them to m0.015 and if the clatter is the same open them back up to 0.017 .

 

I don t over rev the engine, 4000 rpm is about as high as I take it. It s as standard as it can be apart from 0.040 oversize pistons from a rebore before I bought the car.

 

I don t need speed from this car, I have a manic Caterham with 220 BHP weighing 500 kgs. That s for the time I want to shake some cobwebs. Also my everyday car is a 189 bhp Lotus Elise. The TC is for driving sedately along country roads.

 

 

[b][i]Norman Verona[/i][/b]

11 Cherry Close, Royston, South Yorkshire S71 4LZ

Phone: 0044 (0)1226 728811

Mob: 0044 (0)741 9905 741

[b][i]Web: www.frenchblat.com[/i][/b]

 

[b]From:[/b] mg-tabc@yahoogroups.com [mg-tabc@yahoogroups.com] [b]On Behalf Of [/b]David James dr.david.james@gmail.com [mg-tabc] [b]Sent:[/b] 18 February 2018 10:10 [b]To:[/b] mg-tabc@yahoogroups.com [b]Subject:[/b] [mg-tabc] Re: Tappet clearnace on TC (1949)

 

 

I had noticed play in the distributor shaft of my 1948 TC, along with quite a lot of oil in the distributor top, and thought this might be the cause of the noisy engine. So I replaced the bushes in the distributor body. This cured the oil problem, but not the clatter. So I used the method given on the MGCC Y-Type Register web site to determine that the camshaft was still of the type that required a 19thou tappet clearance. On the basis that there are indents on the rockers that my feeler gauge would not detect, I set the clearance to 17thou. It is still noisy, but I am reluctant to reduce the clearance further. David (TC4985)

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David Wardell
Posts: 8
Joined: Sat May 07, 2016 3:41 am

Re: Tappet clearnace on TC (1949)

Post by David Wardell » Mon Feb 19, 2018 1:02 am

The true answer to your query Norman is ... it all depends. I presume you put in a new camshaft when you rebuilt the engine and the grind would (probably) be different from the original TC XPAG grind. And the camshaft supplier would have specified the rocker clearance. A lot of newer camshafts, including those originally fitted to later TDs, specified 12 thou clearance and this figure is quite common for a number of different camshafts available. However ... I got quite a surprise when B&G fitted their fast road cam to my XPEG: the spec for the clearance for that is 18 thou inlet, 20 thou exhaust ... I ve got used to the noise and cam is great. David
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, what do you wsant to instll them on
Posts: 5
Joined: Thu Feb 01, 2018 6:46 am

Re: Tappet clearnace on TC (1949)

Post by , what do you wsant to instll them on » Tue Feb 20, 2018 1:09 pm

Actually if rocker gear is in good shape , faces of rockers, shaft and bushes  .019 in not that noisy , but I doubt there are any usable 019 cams still in use that grind was dropped 50 years ago ( I bought a New cam for my TD from MG dealer in 1972 and the TF grind was supplied)  , and the way T types ate cams and tappets well you do the math Joe Curto 718-762-7878 www.joecurto.com -----Original Message----- From: tjackson125@gmail.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> To: mg-tabc mg-tabc@yahoogroups.com> Sent: Sun, Feb 18, 2018 12:21 pm Subject: [mg-tabc] Re: Tappet clearnace on TC (1949)   I d stick with the camshaft spec for valve clearance, and accept the tappet clatter.  Unusually quiet would worry me. #ygrps-yiv-649395014 #ygrps-yiv-649395014AOLMsgPart_2_d2c57309-6277-4462-beea-7a2f4587360d td{color:black;}#ygrps-yiv-649395014 .ygrps-yiv-649395014aolReplacedBody #ygrps-yiv-649395014aolmail_ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 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