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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”
- 1970-1979 Intake Valve:
- Both 1954-1978 Parts Catalogs (99451-78A issued in April of 1981 & 99451-78B copyright 1989) list the intake valve for 1970-1978 as the newer (Nittan 18027-80 or Eaton 18028-80 w / 3 angle seat) but these -80 valves began use in 1980. The 1979 parts catalogs (99451-79 & 99451-79A) and the 1979-1980 (99451-80) still show the 18070-70 intake valve as the current part number.
| Valves and Components | ||||||||
| Intake Group | 1957-1959 XL 1958 XLC | 1958-1969 XLH/XLCH | 1970-1979 XLH/XLCH | 1980-1985 XL / XLS / XLX | ||||
|---|---|---|---|---|---|---|---|---|
| Valve | 18070-57 (1-11/16“ Dia)2) | 18070-58 (1-13/16” Dia) 3) | 18070-70 | 18027-80 (Nittan) 18028-80 (Eaton) either brand is standard |
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| 18027-80 (Nittan) 18028-80 (Eaton) either brand is standard (added in 81) (replacement for 1979) | ||||||||
| Valve Guide | 18176-57 (Std) 18179-57 (.001“ OS) 18180-57 (.002” OS) (replaced in '59 by ↓) | 18176-57 (Std) 18179-57 (.001“ OS) 18180-57 (.002” OS) (replaced in '59 by ↓) | 18176-57A (Std) 18179-57A (.001“ OS) 18180-57A (.002” OS) (replaced in '80 by ↓) | 18176-80 (Std) (80) (80 only) 18176-57B (Std) (80) (for 79-82) 18179-57B (.001“ OS) (80) ( for 79-82) 18180-57B (.002” OS) (80) (for 79-82) 18191-79 (.004“ OS) (81) (for 79-82) (All replaced in '83 by ↓) |
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| 18176-57A (Std) 18179-57A (.001” OS) 18180-57A (.002“ OS) | 18176-57A (Std) 18179-57A (.001” OS) 18180-57A (.002“ OS) | 18176-57B (Std) 18179-57B (.001” OS) 18180-57B (.002“ OS) 18191-79 (.004“ OS) (81) (for 79-82) (replaced in '83 by ↓) | 18176-57C (Std) 18179-57C (.001” OS) 18180-57C (.002“ OS) 18191-79A (.004” OS) |
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| 18176-57C (Std) 18179-57C (.001“ OS) 18180-57C (.002” OS) 18191-79A (.004“ OS) (for 79-85) | ||||||||
| Valve Guide Retainer Ring | 18120-80 (80 only) |
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| Valve Seat Insert | ||||||||
| Spring Collar (lower) | 18220-57 | 18220-57 | 18220-57 | 18220-80 (80) 18220-57 (80-E81) |
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| 18220-81 (L81-E83) | ||||||||
| 18220-83 (L83-85) | ||||||||
| Valve Spring (inner) | 18204-57 (replaced in 71 by ↓) | 18204-57 (replaced in 71 by ↓) | 18204-57 (replaced in 71 by ↓) | 18204-57A (71-E83) | ||||
| 18204-57A (for 57-E83) | 18204-57A (for 57-E83) | 18204-57A (for 57-E83) | 18204-83 (L83-85) | |||||
| Valve Spring (outer) | 18203-57 (replaced in 71 by ↓) | 18203-57 (replaced in 71 by ↓) | 18203-57 (replaced in 71 by ↓) | 18203-57A (71-E83) | ||||
| 18203-57A (for 57-E83) | 18203-57A (for 57-E83) | 18203-57A (for 57-E83) | 18203-83 (L83-85) | |||||
| Spring Collar (upper) | 18221-57 (replaced in '59 by ↓) | 18221-57 (replaced in '59 by ↓ ) | 18221-57A (replaced in 82 by ↓ ) | 18221-57B | ||||
| 18221-57A (for 57 up) | 18221-57A (for 58 up) | 18221-57B | ||||||
| Valve Keepers (keys) | 18228-30 | 18228-30 | 18228-30 | 18228-30 | ||||
| Valve Stem Cap | X | X | X | X | ||||
| Exhaust Group | 1957-1959 XL 1958 XLC | 1958-1969 XLH/XLCH | 1970-1979 XLH/XLCH | 1980-1985 XL / XLS / XLX | ||||
|---|---|---|---|---|---|---|---|---|
| Valve | 18080-57 | 18080-58 (58-62 XLH) (58-61 XLCH) (obsolete for 63) | 18080-58A | 18033-80 (Nittan) 18036-80 (Eaton) either brand is standard |
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| 18080-58A (63 and up XLH) (62 and up XLCH) (58 and up replacement) | 18033-80 (Nittan) 18036-80 (Eaton) either brand is standard (added in 81) (replacement for 1979) | |||||||
| Valve Guide | 18170-57 (Std) 18171-57 (.001” OS) 18172-57 (.002“ OS) | 18170-57 (Std) 18171-57 (.001” OS) 18172-57 (.002“ OS) | 18170-57 (Std) 18171-57 (.001” OS) 18172-57 (.002“ OS) (replaced in '80 by ↓) | 18170-80 (Std) (80) 18170-57A (Std) (81) 18171-57A (.001” OS) 18172-57A (.002“ OS) |
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| 18170-57A (Std) 18171-57A (.001” OS) 18172-57A (.002“ OS) | 18168-79 (.004” OS) (added in 81) (for 79-82) |
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| 18168-79 (.004” OS) (added in 1981) (for 79-82) | 18168-79A (.004“ OS) (for 83-85) |
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| Valve Guide Retainer Ring | 18120-80 | |||||||
| Valve Seat Insert | ||||||||
| Spring Collar (lower) | 18220-57 | 18220-57 | 18220-57 | 18220-80 | ||||
| Valve Spring (inner) | 18204-57 (replaced in 71 by ↓) | 18204-57 (replaced in 71 by ↓) | 18204-57 (replaced in 71 by ↓) | 18204-57A | ||||
| 18204-57A (for 57-E83) | 18204-57A (for 57-E83) | 18204-57A (for 57-E83) | ||||||
| Valve Spring (outer) | 18203-57 (replaced in 71 by ↓) | 18203-57 (replaced in 71 by ↓) | 18203-57 (replaced in 71 by ↓) | 18203-57A | ||||
| 18203-57A (for 57-E83) | 18203-57A (for 57-E83) | 18203-57A (for 57-E83) | ||||||
| Spring Collar (upper) | 18222-57 (57-E58) | 18222-57 (57-E58) | 18221-57A | 18221-57A | ||||
| 18221-57A (L58 up) | 18221-57A (L58 up) | |||||||
| Valve Keepers (keys) | 18228-57 (57-E58) | 18228-57 (57-E58) | 18228-30 | 18228-30 | ||||
| 18228-30 (L58 up) | 18228-30 (L58 up) | |||||||
| Valve Stem Cap | 18234-57 (57-E58 only) | 18234-57 (57-E58 only) | X | X | ||||
| (L58 up - Obsolete) | (L58 up - Obsolete) |
1)
HD Service Bulletin #M-870 dated April 15, 1983
