kdatsun610p Posted March 15, 2012 Report Share Posted March 15, 2012 How do u set the valves on an L20 ? Every time i set them they start clanking. So how do I exactly do it do it doesn't make noise again? Quote Link to comment
crackerjack69 Posted March 15, 2012 Report Share Posted March 15, 2012 How do u set the valves on an L20 ? Every time i set them they start clanking. So how do I exactly do it do it doesn't make noise again? Mklotz has an excellent video on this forum for this :D Can you describe what method you are using? Quote Link to comment
kdatsun610p Posted March 15, 2012 Author Report Share Posted March 15, 2012 I put the feeler guage and slide it in and out till it good and then I tighten it and where the video exactly? Quote Link to comment
crackerjack69 Posted March 15, 2012 Report Share Posted March 15, 2012 http://community.ratsun.net/topic/16539-l-series-valve-adjustment/ Quote Link to comment
kdatsun610p Posted March 15, 2012 Author Report Share Posted March 15, 2012 Thanks:) Quote Link to comment
bananahamuck Posted March 15, 2012 Report Share Posted March 15, 2012 In my opinion setting them so tight they don`t make any noise at all is to tight...tends to burn the valves if ran real hard .and always do them with engine hot.. But everybody has a different opinion.. Quote Link to comment
kdatsun610p Posted March 15, 2012 Author Report Share Posted March 15, 2012 In my opinion setting them so tight they don`t make any noise at all is to tight...tends to burn the valves if ran real hard .and always do them with engine hot.. But everybody has a different opinion.. So how warm should the engine be like average temp.? And what size feeler gauge should I use when hot? Quote Link to comment
datzenmike Posted March 15, 2012 Report Share Posted March 15, 2012 Have tools ready, take car out for 15 min drive and you are ready. Set motor to TDC #1 compression and set the following valves: I =intake, E = exhaust E on # 1 I on # 1 I on # 2 E on # 3 Turn motor exactly one revolution and bring to TDC mark. E on # 2 I on # 3 I on # 4 E on # 4.... done. You should be able to do this befoe the motor cools significantly. Quote Link to comment
DanielC Posted March 15, 2012 Report Share Posted March 15, 2012 The valves on a L engine will make a little noise. If they are not making some noise, they are too tight, possibly holding a valve open slightly, and that will lead to burned valves, and the need to remove the head, and do a valve job. I have found that if you set them at .008 intake, and .010 exhaust COLD, they will be around .010 intake, and .012 exhaust hot. Quote Link to comment
kdatsun610p Posted March 16, 2012 Author Report Share Posted March 16, 2012 Thanks guys I think i got them set... How much compression should be in each cylinder? Quote Link to comment
crackerjack69 Posted March 16, 2012 Report Share Posted March 16, 2012 Really depends. More important that the cylinders are all close to same compression. My truck's recent results were 165 cold Quote Link to comment
kdatsun610p Posted March 16, 2012 Author Report Share Posted March 16, 2012 Really depends. More important that the cylinders are all close to same compression. My truck's recent results were 165 cold All of them are at 140 cold .. Is there a way to increases compression? Before I had and L18 head on my motor and it had about 195 cold Quote Link to comment
datzenmike Posted March 16, 2012 Report Share Posted March 16, 2012 140 is..... ok. Higher is always better but as long as even across it will idle and run fine. Was the L18 head a closed chamber A-87?? What head in on there now? Quote Link to comment
DanielC Posted March 16, 2012 Report Share Posted March 16, 2012 A compression test on an engine can vary a lot depending on the a lot of other factors, besides the condition of the rings and valves. It should be done when the engine is at normal operating temperature, throttle wide open, without spark plugs in any cylinders, with a fully charged battery, and a good starter. My service manual says compression should be between 159 and 171 PSI, at a cranking RPM of 350. this is for a L-16. L-20-B engines may be different. If after doing a compression test, you put about a teaspoon of engine oil in each cylinder, and do a compression test again, and the numbers go up a significant amount, it is an indication of piston ring wear. Quote Link to comment
kdatsun610p Posted March 16, 2012 Author Report Share Posted March 16, 2012 140 is..... ok. Higher is always better but as long as even across it will idle and run fine. Was the L18 head a closed chamber A-87?? What head in on there now? I don't kno what's an a-87 ... But I have an L20 head Quote Link to comment
kdatsun610p Posted March 16, 2012 Author Report Share Posted March 16, 2012 A compression test on an engine can vary a lot depending on the a lot of other factors, besides the condition of the rings and valves. It should be done when the engine is at normal operating temperature, throttle wide open, without spark plugs in any cylinders, with a fully charged battery, and a good starter. My service manual says compression should be between 159 and 171 PSI, at a cranking RPM of 350. this is for a L-16. L-20-B engines may be different. If after doing a compression test, you put about a teaspoon of engine oil in each cylinder, and do a compression test again, and the numbers go up a significant amount, it is an indication of piston ring wear. Thanks il try it out Quote Link to comment
datzenmike Posted March 16, 2012 Report Share Posted March 16, 2012 I don't kno what's an a-87 ... But I have an L20 head I guess my post this morning didn't go through. For head ID look on the bottom outside edge just behind the #1 spark plug. . Quote Link to comment
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