 Ot 74 911 no spark help.. |
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| mb911 |
 Apr 9 2017, 02:29 PM
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#1
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914 Guru  Group: Members Posts: 7,704 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest 
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So a while ago I posted about taking on a basket case 911 project that had the engine out for a long time..
Well engine is in everything is hooked up but trying to fire this thing up and am having very intermittent spark.. The cdi box was a no go and hooked up a used msd box and now I see spark every once and a while. Looking for a little advice.. What should I check next.. Points hanging up ? |
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| mb911 |
Jun 17 2017, 05:45 AM
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#2
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914 Guru Group: Members Posts: 7,704 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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So update on this project is that finally got it running well.. Excited to get it out of my shop.. Will be leaving at the end of the month. Currently try to figure out why there is no voltage regulator, and why the silicone valve cover gaskets on passenger side are leaking..
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| Mark Henry |
Jun 17 2017, 06:23 AM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(mb911 @ Jun 17 2017, 07:45 AM)  Currently try to figure out why there is no voltage regulator, and why the silicone valve cover gaskets on passenger side are leaking.. No voltage regulator or the VR is not working? There is internal and external VR's No idiot light is a big cause of issues as it needs the idiot light to excite the field in the alternator. Some of the Bosch 911 alternator's are very sensitive to having the correct matching Bosch VR. Other causes are wiring connections, ground issues, brushes, dead VR, wrong VR. Silicone valve cover gaskets, I bet they are cranked on too hard. You have to use nyloc nuts and less than factory torque, almost half. |
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| mb911 |
Jun 17 2017, 07:29 AM
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#4
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914 Guru Group: Members Posts: 7,704 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(Mark Henry @ Jun 17 2017, 04:23 AM) QUOTE(mb911 @ Jun 17 2017, 07:45 AM) Currently try to figure out why there is no voltage regulator, and why the silicone valve cover gaskets on passenger side are leaking.. No voltage regulator or the VR is not working? There is internal and external VR's No idiot light is a big cause of issues as it needs the idiot light to excite the field in the alternator. Some of the Bosch 911 alternator's are very sensitive to having the correct matching Bosch VR. Other causes are wiring connections, ground issues, brushes, dead VR, wrong VR. Silicone valve cover gaskets, I bet they are cranked on too hard. You have to use nyloc nuts and less than factory torque, almost half. Yup no voltage regulator.. I see the wires double blue, black , and brown. I have an extra regulator so i will have to try it.. I will try to loosen the valve covers a bit and see what happens. |
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Posts in this topic
mb911 Ot 74 911 no spark help.. Apr 9 2017, 02:29 PM
Dave_Darling Definitely check for the points opening and closin... Apr 9 2017, 04:15 PM
infraredcalvin
Definitely check for the points opening and closi... Apr 9 2017, 09:31 PM mb911 Ok have decent enough spark now and got it to fire... Apr 10 2017, 01:54 PM Jeffs9146 FI or Carbs? Apr 10 2017, 03:17 PM mb911
FI or Carbs?
Cis.. Apr 10 2017, 04:27 PM Jeffs9146 Check for vacuum leaks. When I installed my motor ... Apr 11 2017, 12:06 AM mb911
Check for vacuum leaks. When I installed my motor... Apr 11 2017, 07:22 PM Jeffs9146
Check for vacuum leaks. When I installed my moto... Apr 11 2017, 08:03 PM mepstein Tony Danato (on pelican) will rebuild a WUR and fu... Apr 11 2017, 08:15 PM mb911
Tony Danato (on pelican) will rebuild a WUR and f... Apr 12 2017, 06:52 AM |
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