Author Topic: Timing Mark  (Read 1828 times)

CJHenderson

  • Full Member
  • Silver
  • ****
  • USA, AR, Benton
  • Posts: 469
Timing Mark
« on: August 06, 2020, 13:28:11 »
Getting ready to replace head gasket and before doing that I set the #1 cylinder to TDC. When checking the timing mark it was on top of 50 Degrees. Is this normal?
1970 280SL/8 W113 101624 miles.
1950 MG-TD
2021 Harley Davidson CVO Trike

stickandrudderman

  • Vendor
  • Platinum
  • ******
  • United Kingdom, England, Richmond
  • Posts: 2926
    • http://www.colinferns.com
Re: Timing Mark
« Reply #1 on: August 06, 2020, 16:39:20 »
No. with No.1 piston at TDC the pointer should be at "0".
I have seen a few episodes of incompetent installation of the crankshaft pully/damper assembly where the keys are not aligned during incompetent assembly.

mrfatboy

  • Associate Member
  • Platinum
  • ******
  • USA, CA, Rancho Santa Fe
  • Posts: 1339
    • Mrfatboy
Re: Timing Mark
« Reply #2 on: August 06, 2020, 21:28:57 »
A couple of thing to check.

Make sure you have the correct pointer with timing marks mounted. I think there are types. There is a trapezoid and a triangular type. Info is in tech manual.

Make sure you are looking at the correct timing marks. There are outer and inner markings.
1969 280sl (Aug 1968 build)
Signal Red
4 Speed

CJHenderson

  • Full Member
  • Silver
  • ****
  • USA, AR, Benton
  • Posts: 469
Re: Timing Mark
« Reply #3 on: August 06, 2020, 22:16:50 »
I'm looking at the inner ring
1970 280SL/8 W113 101624 miles.
1950 MG-TD
2021 Harley Davidson CVO Trike

kampala

  • Full Member
  • Platinum
  • ******
  • USA, CA, Beach Cities
  • Posts: 1247
Re: Timing Mark
« Reply #4 on: August 06, 2020, 23:51:44 »
Are you sure you are on the compression stroke?   And not exhaust stroke?   Is the distributor rotor pointed to plug wire for cylinder # 1.

if you provide photos it would help.
250sl - later - manual
280sl - 1971 - Auto - LSD

CJHenderson

  • Full Member
  • Silver
  • ****
  • USA, AR, Benton
  • Posts: 469
Re: Timing Mark
« Reply #5 on: August 07, 2020, 01:10:11 »
Looks like I was on the exhaust stroke so I turned it 180. Here is two photos showing the distributor aligned to the timing mark and the pointer close to TDC pip. When I put the pointer on the pip the distributor looks like it's about 20 degree ATDC.
« Last Edit: August 07, 2020, 01:15:20 by CJHenderson »
1970 280SL/8 W113 101624 miles.
1950 MG-TD
2021 Harley Davidson CVO Trike

ja17

  • Full Member
  • Platinum
  • ******
  • USA, OH, Blacklick
  • Posts: 7414
Re: Timing Mark
« Reply #6 on: August 08, 2020, 06:45:15 »
Watch to see when the points open as you turn the engine in the normal direction. Set it so the points opening is close to TDC "0".  This should be good enough to get it running. Then set it about 30 BTDC at 3,000 rpms.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

CJHenderson

  • Full Member
  • Silver
  • ****
  • USA, AR, Benton
  • Posts: 469
Re: Timing Mark
« Reply #7 on: August 08, 2020, 14:33:52 »
Great thanks
1970 280SL/8 W113 101624 miles.
1950 MG-TD
2021 Harley Davidson CVO Trike