While doing my shims (I had both cams out while taking the buckets out) I gets called in by the wife and my son goes in the garage mooching about and sees the rachet still attached to the crank and decides to give it an exploratory turn or two. After kicking his arse around the garage (he's thirteen and hasn't a clue!) I'm left with a dilemma, which TDC is going to be on the compression stroke so I can set the cams up again. Any ideas anyone?
Which Tdc Is Which?
Started by
moodygaz
, Jun 17 2013 08:18 pm
6 replies to this topic
#1
moodygaz
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Posted 17 June 2013 - 08:18 pm
#2
moodygaz
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Posted 17 June 2013 - 08:23 pm
Oh and while i'm about it I'm going to do a compression check while everythings out, what should the compression be?
#3
Studley Ramrod
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Posted 17 June 2013 - 08:31 pm
The only way to know for sure is to remove the spark plugs and stick a length of dowel or similar in each plug hole and you'll see which cylinder is at TDC when the crank mark lines up. Make sure the length of the dowels is plenty long enough.
Compression for a mk2 is Standard = 175psi with max = 182psi and min = 145psi
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#4
moodygaz
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Posted 17 June 2013 - 08:45 pm
The only way to know for sure is to remove the spark plugs and stick a length of dowel or similar in each plug hole and you'll see which cylinder is at TDC when the crank mark lines up. Make sure the length of the dowels is plenty long enough.
Compression for a mk2 is Standard = 175psi with max = 182psi and min = 145psi
but how will I know if its on the compression stroke or the exhaust?
#5
Studley Ramrod
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Posted 17 June 2013 - 09:00 pm
Hang on a min, I'm confusing myself here. 270 crank with wasted spark. Edit: correction, does not have wasted spark.
Right, if the crank is at TDC then the no.1 cyl must also be at TDC. Compression and exhaust stroke are controlled via the camshafts.
Mk2a 2000 in Silver. Top end Refurb @ 41100 miles, Scottoiler, Renthal Road High Bars, Up & Back Bar Risers, Bellypan, DL650 Handguards, Capt. Picard Bar Ends, House of Henty SS Wheel spacers, New Seat Cover Fitted. 58 MPG !! Now owned by chrisbee ! Studley's mk2a Bloggerydoodaah ! Photos of my first MK1 Photos of my MK2a TPLQHCSRSFC No. 1 Fan
#6
moodygaz
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Posted 17 June 2013 - 09:08 pm
Ahh light is dawning!!! so as long as the crank is at 'T' and I set the cams lobes outwards, I'm sorted. I forgot about the wasted spark!
#7
leehenty
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Posted 18 June 2013 - 08:56 am
studley is right so long as the 'T' is aligned and the in on the inlet cam and the ex on the exhaust cam line up level you are there.
Edited by leehenty, 18 June 2013 - 08:57 am.
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