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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”
1957-1959 XL 2) 3)
1958 XLC		ValveValve GuideLower
Spring Collar		Inner
Valve Spring		Outer
Valve Spring		Upper
Spring Collar		Keepers
(keys)		Valve Stem
Cap
Intake Group18070-57
(1-11/16“ Dia)4)		18176-57 (Std)
18179-57 (.001” OS)
18180-57 (.002“ OS)
(replaced in '59 by ↓)		18220-5718204-5718203-5718221-57
(replaced in '59 by ↓ )		18228-30 X
18176-57A (Std)
18179-57A (.001” OS)
18180-57A (.002“ OS)		18221-57A
(57 and up)
Exhaust Group18080-5718170-57 (Std)
18171-57 (.001” OS)
18172-57 (.002“ OS)		18220-5718204-5718203-5718222-57
(57-E58)		18228-57
(57-E58)		18234-57
(57-E58)
(discontinued - L58)
18221-57A
(L58 and up)		18228-30
(L58 and up)		 X
1958-1969 XLH/XLCH
5) 6) 7) 8) 9) 10)
11) 12) 13) 14) 15)		ValveValve GuideLower
Spring Collar		Inner
Valve Spring		Outer
Valve Spring		Upper
Spring Collar		Keepers
(keys)		Valve Stem
Cap
Intake Group18070-58
(1-13/16” Dia) 16)		18176-57 (Std)
18179-57 (.001“ OS)
18180-57 (.002” OS)
(replaced in '59 by ↓)		18220-5718204-5718203-5718221-57
(replaced in '59 by ↓ )		18228-30 X
18176-57A (Std)
18179-57A (.001“ OS)
18180-57A (.002” OS)		18221-57A
(58 and up)
Exhaust Group18080-58
(58-62 XLH)
(58-61 XLCH)
(obsoleted in 63) 		18170-57 (Std)
18171-57 (.001“ OS)
18172-57 (.002” OS)		18220-5718204-5718203-5718222-57
(57-E58) 		18228-57
(57-E58)		18234-57
(57-E58)
(discontinued - L58)
18080-58A
(63 and up XLH)
(62 and up XLCH)
(58 and up replacement)		18221-57A
(L58 and up)		18228-30
(L58 and up)		 X
1970-1979 XLH/XLCH
17) 18) 19) 20) 21) 22) 23) 24) 25) 		ValveValve GuideLower
Spring Collar		Inner
Valve Spring		Outer
Valve Spring		Upper
Spring Collar		Valve Keepers (keys)
Intake Group18070-70
(replaced in '80 by ↓)
(with 3-angle valve job)
18027-80 (Nittan)
18028-80 (Eaton)		18176-57A (Std)
18179-57A (.001“ OS)
18180-57A (.002” OS)		18220-5718204-5718203-5718221-57A18228-30
Exhaust Group18080-58A
(replaced in '80 by ↓)
(with 3-angle valve job)
18033-80 (Nittan)
18036-80 (Eaton)		18170-57 (Std)
18171-57 (.001“ OS)
18172-57 (.002” OS)
  • 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.


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
3) , 5)
1952-1959 HD Spare Parts Catalog for all Sportster and K Models pg 5
4) , 16)
HD Service Bulletin #392 dated 11-27-1957
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
10)
1964 HD Supplement to Spare Parts Catalog for Sportster and KH Models
11)
1955-1965 HD Sportster and KH Model Parts Catalog
12)
1966 HD Sportster and KH Model Parts Catalog Supplement
13)
1957-1967 HD Sportster and KH Model Parts Catalog
14)
1967-68 HD Sportster and KH Model Parts Catalog Supplement
15)
1959-1969 HD Sportster and KH Model Parts Catalog Supplement
17)
1961-1971 HD Sportster Parts Catalog
18)
1961-1972 HD Sportster Parts Catalog Supplement
19)
1962-1973 HD Sportster Parts Catalog
20)
1962-1974 HD Sportster Parts Catalog Supplement
21)
1962-1976 HD Sportster Parts Catalog Supplement
22)
1954-1977 HD Sportster Parts Catalog Supplement
23)
1954-1978 HD Sportster Parts Catalog Supplement
24)
1954-1978 HD Sportster Parts Catalog (see below)
25)
1979 HD Sportster Parts Catalog
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Trace: • IH: Engine Mechanicals - Sub-03F