Valve clearances....

BX Tech talk
KevR
1K Away
1K Away
Posts: 1767
Joined: Mon Apr 12, 2010 8:46 pm
Location: Normandy
My Cars: It's all in my signature
x 4

Valve clearances....

Post by KevR » Sun Mar 20, 2016 7:28 pm

Quick question. I need to do the valve clearances on the grey one, but I've already got the timing belt etc off. Can't turn the cam with engine at TDC obviously, but as far as I remember if I turn the crank a quarter turn that should put the pistons halfway up the bores so I can safely turn the cam with a spanner to check all the clearances. Then put the crank back to TDC so I can fit the belt. s that right or did I dream it? It's 104,000 miles since I touched the valves so it;s all a bit hazy!
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

User avatar
Kitch
Over 2k
Posts: 6207
Joined: Sun Jul 03, 2005 9:36 pm
Location: Fareham, Hants
x 49

Re: Valve clearances....

Post by Kitch » Mon Mar 21, 2016 10:09 am

You don't need to have the engine at TDC to do the belt, the timing marks on the pulley are set with the engine in the safe position, not TDC. Or so it is on the 1.9 petrol and 16v anyway. On a SOHC XU you can rotate the camshaft with the block in the safe position, but you have to be careful on the 16v as sometimes the inlets can strike the exhausts!

Unless I'm dreaming all this up now lol!

KevR
1K Away
1K Away
Posts: 1767
Joined: Mon Apr 12, 2010 8:46 pm
Location: Normandy
My Cars: It's all in my signature
x 4

Re: Valve clearances....

Post by KevR » Mon Mar 21, 2016 10:30 am

Hmm, so why can't I turn the cam then....
Should have mentioned this is a 1.7 TD....
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

User avatar
Kitch
Over 2k
Posts: 6207
Joined: Sun Jul 03, 2005 9:36 pm
Location: Fareham, Hants
x 49

Re: Valve clearances....

Post by Kitch » Mon Mar 21, 2016 1:52 pm

If it was a valve against a piston, you'd still be able to rotate it in one direction. Just double checked, and the GT's pistons are in the safe position when the timing marks are aligned.

KevR
1K Away
1K Away
Posts: 1767
Joined: Mon Apr 12, 2010 8:46 pm
Location: Normandy
My Cars: It's all in my signature
x 4

Re: Valve clearances....

Post by KevR » Mon Mar 21, 2016 2:02 pm

Thanks! Just realised the HP pump belt is still connected.... Perhaps that's the problem! Will check.
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

User avatar
Kitch
Over 2k
Posts: 6207
Joined: Sun Jul 03, 2005 9:36 pm
Location: Fareham, Hants
x 49

Re: Valve clearances....

Post by Kitch » Mon Mar 21, 2016 3:40 pm

KevR wrote:Thanks! Just realised the HP pump belt is still connected.... Perhaps that's the problem! Will check.
I'd be surprised, but it's possible I guess!

KevR
1K Away
1K Away
Posts: 1767
Joined: Mon Apr 12, 2010 8:46 pm
Location: Normandy
My Cars: It's all in my signature
x 4

Re: Valve clearances....

Post by KevR » Mon Mar 21, 2016 4:36 pm

Tied to the computer with a story deadline this afternoon, but will try and get a look at it this evening. Been putting the whole job off for ages and now I remember why - I'd forgotten just what an utter bastard of a job it is working on the TD engines in a RHD BX... especially as the other thing I need to do is track down a water leak from somewhere up behind the engine, where there's zero access...
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

User avatar
Kitch
Over 2k
Posts: 6207
Joined: Sun Jul 03, 2005 9:36 pm
Location: Fareham, Hants
x 49

Re: Valve clearances....

Post by Kitch » Mon Mar 21, 2016 4:46 pm

They're easier than a 16v, if that makes you feel any better!

KevR
1K Away
1K Away
Posts: 1767
Joined: Mon Apr 12, 2010 8:46 pm
Location: Normandy
My Cars: It's all in my signature
x 4

Re: Valve clearances....

Post by KevR » Mon Mar 21, 2016 4:51 pm

Really? Remind me not to buy a 16V then! On the TD it's the turbo that really screws things up - bloocking access to hoses etc from behind the engine. Plus of course the lack of clearance at the timing belt end, but that's the same for all the later engines I suppose.
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

KevR
1K Away
1K Away
Posts: 1767
Joined: Mon Apr 12, 2010 8:46 pm
Location: Normandy
My Cars: It's all in my signature
x 4

Re: Valve clearances....

Post by KevR » Tue Mar 22, 2016 12:30 pm

Well, I looked again. Seems the timing hole on the TD is indeed at TDC. Turned the crank 90 degrees and can now turn camshaft easily to check clearances.
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!