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tristanblue
Samba Member
Joined: May 30, 2019
Posts: 348
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 Posted: Sun Sep 03, 2023 12:20 pm Post subject: Is it possible to check cam crank timing marks block assembled? |
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| I have a 62 beetle been working on that possibly has some cam-crank timing issues. Engine was rebuild 25 years ago by the local VW flipper at the time who is notorious for screwing things up. I have pretty much exhausted all other possible things to check, the last was the cam-crank timing. I can easily pull the gen stand, fuel pump, oil pump etc...but was hoping to avoid tearing this all the way down to the crank. From a spare bare case I have sitting here looks like it "might" be possible to see the marks through the gen stand opening. Anyone know if this or another trick is possible? |
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allamaabroad
Samba Member
Joined: September 22, 2016
Posts: 560
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| Posted: Sun Sep 03, 2023 4:11 pm Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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Almost positive you could check it if you pull the oil pump out. Pull the pump and use a bore scope or a little mirror.
You could also compare the orientation of the slot in the cam to the crank, especially if you have a degree pulley. The oil pump slot in the cam is in line with the timing mark on the cam gear.
I personally haven’t done either of these, but to me it seems like the most viable method |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 80397
Location: Sneaking up behind you
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| Posted: Sun Sep 03, 2023 4:46 pm Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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You can see it even with the pump removed.
I always take a picture before closing the case. I let's me sleep at night.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
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עַם יִשְׂרָאֵל חַי |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4555
Location: viroqua wi.
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| Posted: Sun Sep 03, 2023 5:06 pm Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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| Glenn wrote: |
You can see it even with the pump removed.
I always take a picture before closing the case. I let's me sleep at night. |
Did you miss a NOT in your post? |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 80397
Location: Sneaking up behind you
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| Posted: Sun Sep 03, 2023 5:33 pm Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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| bsairhead wrote: |
| Glenn wrote: |
You can see it even with the pump removed.
I always take a picture before closing the case. I let's me sleep at night. |
Did you miss a NOT in your post? |
Yes...NOT
Sorry, on my phone
_________________
Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare
עַם יִשְׂרָאֵל חַי |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20896
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Sun Sep 03, 2023 6:12 pm Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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If you remove oil pump and put crank at exactly TDC (compression stroke #1 cylinder) the oil pump slot should be at a exact 45° angle...
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
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All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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tristanblue
Samba Member
Joined: May 30, 2019
Posts: 348
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| Posted: Sun Sep 03, 2023 7:04 pm Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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| Glenn wrote: |
| bsairhead wrote: |
| Glenn wrote: |
You can see it even with the pump removed.
I always take a picture before closing the case. I let's me sleep at night. |
Did you miss a NOT in your post? |
Yes...NOT
Sorry, on my phone |
Confused there for a second. So you can NOT see it at all even with the oil pump removed. No mirrors or anything would do it correct?
| Dale M. wrote: |
If you remove oil pump and put crank at exactly TDC (compression stroke #1 cylinder) the oil pump slot should be at a exact 45° angle...
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I have read this but it seems like it might be vague enough that would be difficult to see if you are only one tooth off...or is this pretty precise? |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27754
Location: Colorado Springs
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| Posted: Sun Sep 03, 2023 7:55 pm Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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You can check the cam TIMING with the engine assembled.
Overlap should be near centered around TDC, you can tell that just with your eyes and hands if it's close or way off.
Google how to "degree a cam" to see if the cam is timed right. |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20896
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Mon Sep 04, 2023 7:26 am Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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| Dale M. wrote: |
"]If you remove oil pump and put crank at exactly TDC (compression stroke #1 cylinder) the oil pump slot should be at a exact 45° angle...
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I have read this but it seems like it might be vague enough that would be difficult to see if you are only one tooth off...or is this pretty precise?[/quote]
Simple a $1.99 from any stationary store...
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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FarmerBill
Samba Member
Joined: July 25, 2017
Posts: 891
Location: New England
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| Posted: Mon Sep 04, 2023 9:10 am Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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| tristanblue wrote: |
I have read this but it seems like it might be vague enough that would be difficult to see if you are only one tooth off...or is this pretty precise? |
With 50(?) teeth on the cam gear that equals a bit over 7 degrees per tooth, so it should be pretty noticeable. |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27754
Location: Colorado Springs
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| Posted: Mon Sep 04, 2023 9:47 am Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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| which would be 15.4 degrees at the crank |
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Slow 1200
Samba Member
Joined: July 02, 2004
Posts: 2130
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| Posted: Mon Sep 04, 2023 11:41 am Post subject: Re: Is it possible to check cam crank timing marks block assembled? |
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| modok wrote: |
Overlap should be near centered around TDC, you can tell that just with your eyes and hands if it's close or way off |
just do this, it takes 30 seconds |
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