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Old 24-11-2019, 03:54 PM   #1
adman020
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Default engine not rotating

I'm doing a top end upgrade sp1300 to tp1600 (70 beetle) got to the stage of torqueing heads then discovered that when turning the flywheel it gets stuck when cylinder no1 piston goes back into the case. I took all apart again , took the no1 piston off and still something seems to be fouling?? I'm not sure it it's a stud, oil pump or something else that could cause this without splitting the case?


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Old 24-11-2019, 05:54 PM   #2
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You got to go back to basics. Check the cam followers are all seated through the push rod holes. Check the distributor drive is correctly seated and check you haven’t dropped something inside the case. Get a strong light and have a good look at everything that moves. Good luck
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Old 25-11-2019, 09:08 AM   #3
'77 Westy
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Have you removed the distributor?
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Old 25-11-2019, 01:25 PM   #4
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I had this once it was the one of the head studs going too far into the engine and hitting the crank it would go back and forward fine just hit in one place . Check if you have had the studs out that you have put them in the correct place as some are longer
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Old 25-11-2019, 09:04 PM   #5
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yep dizzy removed. I think you might be right about head studs as I have just put some of the head studs back. I swear I have never had this issue while the engine has been out... I'm having the issue when piston 1 goes back into the case. Are there any specific lengths these studs should be? I have just bought 4 shorter studs for those middle ones as now it's a twinport.
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Old 25-11-2019, 09:28 PM   #6
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If you turn the engine with the distributor removed the drive shaft can jam against and probably damage the brass gear on the crank – unless you also remove the distributor drive shaft of course.
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Old 25-11-2019, 11:14 PM   #7
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Have you also changed the oil pump or is it the same one ?


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Old 01-12-2019, 05:25 PM   #8
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old gh bug you were right - it was the short head stud next to cylinder 3 that was too far in. Found this out as it had the most vibration when moving the flywheel by hand. At least I have lean't this now, not later cheers all
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Old 02-12-2019, 11:19 AM   #9
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Result , easy done glad you got it sorted.
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