This is an old revision of the document!
IH: Engine Mechanicals - Sub-03F
1983 Valve Guide Changes
- Beginning with crankcase number 783, new style intake and exhaust valve guides were introduced XL 1000cc engines along with new flat lower spring collars and longer inner and outer springs. 1)
- The longer springs provide increased spring tension. But, the new lower spring collars and longer springs can only be used with the new style valve guides. The new springs were identified as having red or orange paint on several springs.
- The new style (shoulder-less) valve guides were also used for service replacement of the old style guides on all 1000cc engines and do allow the use of all old valve train components. Because the new style valve guides do not have a shoulder as the old ones did, a special valve guide driver (HD-33871) must be used to control the guide installed height.
- New intake valve guides should protrude .594“-.604” above the head casting.
- New exhaust valve guides should protrude .640“-.650” above the head casting.
- Outer Spring Load:
- Valve Closed, 52-67 lbs. @ 1-3/8“
- Valve Open, 171.6 - 194.4 lbs. @ 3/32”
- Inner Spring Load:
- Valve Closed, 20.9 - 29.1 lbs. @ 1-13/64“
- Valve Open, 79.7 - 90.3 lbs. @ 25/32”
- Spring Free Length:
- Outer Spring, 1-9/16“
- Inner Spring, 1-11/32”
| 1957-1959 XL 2) 3) 1958 XLC | Valve | Valve Guide | Lower Spring Collar | Inner Valve Spring | Outer Valve Spring | Upper Spring Collar | Keepers (keys) | Valve Stem Cap |
|---|---|---|---|---|---|---|---|---|
| Intake Group | 18070-57 (1-11/16“ Dia)4) | 18176-57 (Std) 18179-57 (.001” OS) 18180-57 (.002“ OS) (replaced in '59 by ↓) | 18220-57 | 18204-57 | 18203-57 | 18221-57 (replaced in '59 by ↓ ) | 18228-30 | X |
| 18176-57A (Std) 18179-57A (.001” OS) 18180-57A (.002“ OS) | 18221-57A (for all 57-59) |
|||||||
| Exhaust Group | 18080-57 | 18170-57 (Std) 18171-57 (.001” OS) 18172-57 (.002“ OS) | 18220-57 | 18204-57 | 18203-57 | 18222-57 (57-E58) | 18228-57 (57-E58) | 18234-57 (57-E58) |
| 18221-57A (L58-59) | 18228-30 (L58-59) | (Not used from L58 and up) |
||||||
| 1958-1963 XLH/XLCH 5) 6) 7) 8) 9) | Valve | Valve Guide | Lower Spring Collar | Inner Valve Spring | Outer Valve Spring | Upper Spring Collar | Keepers (keys) | Valve Stem Cap |
| Intake Group | 18070-58 (1-13/16” Dia) 10) | 18176-57 (Std) 18179-57 (.001“ OS) 18180-57 (.002” OS) (replaced in '59 by ↓) | 18220-57 | 18204-57 | 18203-57 | 18221-57 (replaced in '59 by ↓ ) | 18228-30 | X |
| 18176-57A (Std) 18179-57A (.001“ OS) 18180-57A (.002” OS) | 18221-57A (for all 58-59) |
|||||||
| Exhaust Group | 18080-58 (58-62 XLH) (58-61 XLCH) (obsoleted in '63) | 18170-57 (Std) 18171-57 (.001“ OS) 18172-57 (.002” OS) | 18220-57 | 18204-57 | 18203-57 | 18222-57 (57-E58) | 18228-57 (57-E58) | 18234-57 (57-E58) |
| 18080-58A (63- XLH) (62-63 XLCH) (58 and up replacement) | 18221-57A (L58-59) | 18228-30 (L58-59) | (Not used from L58 and up) |
1)
HD Service Bulletin #M-870 dated April 15, 1983
2)
1952-1957 HD Spare Parts Catalog for all Sportster and K Models pg 6
6)
1959-1960 HD Supplement to Spare Parts Catalog for Sportster and K Models
7)
1959-1961 HD Supplement to Spare Parts Catalog for Sportster and K Models
8)
1959-1962 HD Supplement to Spare Parts Catalog for Sportster and K Models
9)
1963 HD Parts Catalog for Sportster and KH Models
