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techtalk:ih:engmech03f [2018/01/20 06:02] – [1983 Valve Guide Changes] hippysmacktechtalk:ih:engmech03f [2018/01/21 18:42] (current) – [1983 Valve Guide Changes] hippysmack
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 ====== 1983 Valve Guide Changes ====== ====== 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. ((HD Service Bulletin #M-870 dated April 15, 1983)) +  * In 1983, the Moco raised the compression ratio (8.8-1) with a new piston design (.040" higher crown surface) ((HD Service Bulletin #M-856 dated August 6, 1982)) and the use of the earlier style thinner head gasket. This higher compression ratio along with a new two stage ignition system (VOES), provided increased performance while allowing the use of leaded regular grade gasoline. ((HD Service Bulletin #M-856 dated August 6, 1982))  
-    * 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.+  *  Part of this performance upgrade, (beginning with crankcase number 783101037), was the introduction of new style intake and exhaust valve guides for XL 1000cc engines along with new (flat) lower spring collars and longer inner and outer springs. ((HD Service Bulletin #M-870 dated April 15, 1983)) ((HD Service Bulletin #M-870A dated May 10, 1983)) 
 +    * The longer springs provide increased spring tension. __But__, the new lower spring collars (18220-83) 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.     * 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 intake valve guides (should protrude .594"-.604" above the head casting.
         * New exhaust valve guides should protrude .640"-.650" above the head casting.         * New exhaust valve guides should protrude .640"-.650" above the head casting.
-  * Outer Spring Load:+  * Outer Spring (18204-83) Load:
     * Valve Closed, 52-67 lbs. @ 1-3/8"     * Valve Closed, 52-67 lbs. @ 1-3/8"
     * Valve Open, 171.6 - 194.4 lbs. @ 3/32"     * Valve Open, 171.6 - 194.4 lbs. @ 3/32"
-  * Inner Spring Load:+  * Inner Spring (18204-83) Load:
     * Valve Closed, 20.9 - 29.1 lbs. @ 1-13/64"     * Valve Closed, 20.9 - 29.1 lbs. @ 1-13/64"
     * Valve Open, 79.7 - 90.3 lbs. @ 25/32"     * Valve Open, 79.7 - 90.3 lbs. @ 25/32"
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 +
 +The new lower spring collars, inner and outer springs can be used only with the new style shoulder-less valve guides.
 +The new lower collars and new valve springs must be used together to properly locate the  valve springs  and prevent the possibility of coil bind.
 +If replacement valve springs or lower spring collars are needed on models with old style, shouldered guides, the old springs or spring collars should be used.  
  
  
  
-  * 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. 
  
-|  **Heads**  ||||||||| 
-^**Front**^ ^**1957-1959 XL** \\ **1958 XLC**^  ^**1958-1969 XLH/XLCH**^ ^**1970-1979 XLH/XLCH**^  ^**1980-1985 XL / XLS / XLX**^ 
-|-^  |  ^  |  ^  |16673-70 (**70 only**)^  |16673-80 (**80 only**)| 
-|:::^  |  ^  |  ^  |16673-71 (**71 only**)^  |16673-73B \\ (**79**)| 
-|:::^  |  ^  |  ^  |16673-72 (**72**) \\ (**for 72-E73**)^  |16673-73C (**81**) \\ (**for 79-83**)| 
-|:::^  |  ^  |  ^  |16673-73 (**L73**) \\ (**L73-78**)^  |16673-73D \\ (**79-E85**)| 
-|:::^  |  ^  |  ^  |16673-73A (**79 only**)^  |16673-84 (**L85**)| 
-^**Rear**^ ^**1957-1959 XL** \\ **1958 XLC**^  ^**1958-1969 XLH/XLCH**^ ^**1970-1979 XLH/XLCH**^  ^**1980-1985 XL / XLS / XLX**^ 
-|-^  |  ^  |  ^  |16674-70 (**70 only**)^  |16674-80 (**80 only**)| 
-|:::^  |  ^  |  ^  |16674-71 (**71 only**)^  |16674-73B \\ (**79**)| 
-|:::^  |  ^  |  ^  |16674-72 (**72**) \\ (**72-E73**)^  |16674-73C (**81**) \\ (**for 79-83**)| 
-|:::^  |  ^  |  ^  |16674-73 (**L73**) \\ (**L73-78**)^  |16674-73D \\ (**79-E85**)| 
-|:::^  |  ^  |  ^  |16674-73A (**79 only**)^  |16674-84 (**85**) \\ (**79-L85**)| 
-|  **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)((HD Service Bulletin #392 dated 11-27-1957))^  |18070-58 \\ (1-13/16" Dia) ((HD Service Bulletin #392 dated 11-27-1957))^  |18070-70^  |18070-70 (**last use in 80**) \\ 18027-80 (Nittan) \\ 18028-80 (Eaton) \\ **either brand is standard** \\ **for 79-85**| 
-|:::^  |  ^  |  ^  |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 only**) \\ 18176-57B (Std) (**80**) \\ 18179-57B (.001" OS) \\ 18180-57B (.002" OS) \\ 18191-79 (.004" OS) (**81**) \\ (**All replaced in '83 by ↓**)| 
-|:::^  |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) \\ (**for 79-85**)| 
-|:::^  |:::^  |:::^  |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**)| 
-|**Valve Seat** \\ **Repair Insert**^  |18055-58 (**added in 74**) \\ (**for 58-69**)^  |18055-58 (**added in 74**) \\ (**for 58-69**)^  |18055-70 (**added in 74**) \\ (**for 70 up**)^  |18055-70| 
-|**Spring Collar** \\ **(lower)**^  |18220-57^  |18220-57^  |18220-57^  |18220-80 (**80 only**) \\ 18220-57 (**57-E81**) \\ 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**) \\ 18204-83 (**L83-85**)| 
-|:::^  |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 (**71-E83**) \\ 18203-83 (**L83-85**)| 
-|:::^  |18203-57A \\ (**for 57-E83**)^  |18203-57A \\ (**for 57-E83**)^  |18203-57A \\ (**for 57-E83**)^  |:::| 
-|**Spring Collar** \\ **(upper)**^  |18221-57 \\ (**replaced in '59 by ↓**)^  |18221-57 \\ (**replaced in '59 by ↓ **)^  |18221-57A \\ (**replaced in 82 by ↓ **)^  |18221-57A (**L58-81**) \\ 18221-57B (**82**) \\ (**for 79-85**)| 
-|:::^  |18221-57A \\ (**for 57 up**)^  |18221-57A \\ (**for 58 up**)^  |18221-57B \\ (**for 79-85**)^  |:::| 
-|**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^  |18080-58B (**last use in 80**) \\ 18033-80 (Nittan) (**81**) \\ 18036-80 (Eaton) (**81**) \\ **either brand is standard** \\ **for 79-85**| 
-|:::^  |:::^  |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 only**) \\ 18170-57A (Std) (**80**) \\ 18171-57A (.001" OS) \\ 18172-57A (.002" OS) \\ 18168-79 (.004" OS) (**81**) \\ (**for 79-82**) \\ (**All replaced in '83 by ↓**)| 
-|:::^  |  ^  |  ^  |18170-57A (Std) \\ 18171-57A (.001” OS) \\ 18172-57A (.002“ OS) \\ 18168-79 (.004” OS) (**81**) \\ (**for 79-82**) \\ (**replaced in '83 by ↓**)^  |18170-57B (Std) \\ 18171-57B (.001” OS) \\ 18172-57B (.002“ OS) \\ 18168-79A (.004" OS) \\ (**for 79-85**)| 
-|:::^  |  ^  |  ^  |18170-57B (Std) \\ 18171-57B (.001” OS) \\ 18172-57B (.002“ OS) \\ 18168-79A (.004" OS) \\ (**for 79-85**)^  |  | 
-|**Valve Guide** \\ **Retainer Ring**^  |  ^  |  ^  |  ^  |18120-80 (**80 only**)| 
-|**Valve Seat**  \\ **Repair Insert**^  |18052-58 (**added in 74**) \\ (**for 58-85**)^  |18052-58 (**added in 74**) \\ (**for 58-85**)^  |18052-58 (**added in 74**) \\ (**for 58-85**)^  |18052-58| 
-|**Spring Collar** \\ **(lower)**^  |18220-57^  |18220-57^  |18220-57^  |18220-80 (**80 only**) \\ 18220-57 (**57-E81**) \\ 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**) \\ 18204-83 (**L83-85**)| 
-|:::^  |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 (**71-E83**) \\ 18203-83 (**L83-85**)| 
-|:::^  |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 \\ (**replaced in 82 by ↓ **)^  |18221-57A (**L58-81**) \\ 18221-57B (**82**) \\ (**for 79-85**)| 
-|:::^  |18221-57A \\ **(L58 up)**^  |18221-57A \\ (**L58 up**)^  |18221-57B \\ (**for 79-85**)^  |:::| 
-|**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**)^  |:::^  |:::| 
-|:::^  |(**L58 up - Obsolete**)^  |(**L58 up - Obsolete**)^  |  X  ^  |  X  | 
  
  

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