pHeeL tHiZ ViBe
Member
- :
- Mazdaspeed6
started..and now no compression..cam timing? i don't know..well atleast it started once! good luck.
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- Thread starter chriscecc914
- Start date
chriscecc914
Member
- :
- 06 MS6
after it wouldnt start i left. They said they were going to pull the valve cover and check the cam timing and anything else it could be. Ill check back tommorow.
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- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
cam timing will easily throw off compression. which cylinders were registering low or no compression? what were the numbers on the other two cylinders? exact numbers on all four?
chriscecc914
Member
- :
- 06 MS6
cam timing will easily throw off compression. which cylinders were registering low or no compression? what were the numbers on the other two cylinders? exact numbers on all four?
If your looking at the motor from the front of the car, it is the two right side cylinders. To adjust cam timing does the motor have to come out fully again? not exactly sure of the #'s but the left two cylinders where fine, the right two didnt even move the guage.
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- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
pm'ed you some ideas to run by the shop chris, have them call me if they need to
chriscecc914
Member
- :
- 06 MS6
thanks Ken. Does a leak down test require pulling the entire motor again?
Last edited:
ssinstaller
Member
- :
- 2006 MazdaSpeed 6
thanks Ken. Does a leak down test require pulling the entire motor again?
No, they should just have to pull the sparkplugs..
http://en.wikipedia.org/wiki/Leak-down_tester
Last edited:
PerformanceRacing
Member
I'm sure they already did the leak down.. at least any shop should after doing this type of motor work lol.
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- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
may want to check the head and head gasket as well seeing as where the numbers you told me are coming from. head could be warped from the last engine, did they examine this?
chriscecc914
Member
- :
- 06 MS6
yea it went to a machine shop who inspected the head and only found the valves to be damaged
chriscecc914
Member
- :
- 06 MS6
it looks like something on the cams was tightened to much so the cams are coming out and going back to the machine shop. Only the valve cover has to come off so im glad everything doesnt have to come apart. Nothing catostophic so far!!
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- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
so the cams were overtightened or torqued down wrong?
fourthmeal
Banned
the car started perfectly and then it shut off and wouldnt start. Theres no compression in 2 out of 4 cylinders so everything is getting check out.
These engines have been known to jump chain and throw timing. It is a well documented issue, typically from low oil.
pHeeL tHiZ ViBe
Member
- :
- Mazdaspeed6
These engines have been known to jump chain and throw timing. It is a well documented issue, typically from low oil.
your kidding? i haven't heard (eekdance)
fourthmeal
Banned
Absolutely.
From our archives...
Drivability is not the best. Vehicle runs good most of the time, but has some hesitation. Keeps setting a code P0340. Customer states that this all started after the oil was changed and an oil leak developed and it was run very low for a few miles.
Tests/Procedures:
1. Check the camshaft timing to determine if the timing chain may have jumped. With the valve cover off, place a flat bar across the back of the head and into the slots on the camshafts. With the bar in place, verify that the crankshaft position sensor is aligned with the tooth on the front pulley and that the line up bolt can be installed through the front pulley and into the timing cover. If things dont line up, the timing chain has jumped.
Potential Causes:
Jumped timing chain
** Confirmed Fix **
The timing chain had jumped
Tech Tips:
In this case the flat bar couldnt even line up with the slots in the camshafts.
---
This was one case out of MANY.
From our archives...
Drivability is not the best. Vehicle runs good most of the time, but has some hesitation. Keeps setting a code P0340. Customer states that this all started after the oil was changed and an oil leak developed and it was run very low for a few miles.
Tests/Procedures:
1. Check the camshaft timing to determine if the timing chain may have jumped. With the valve cover off, place a flat bar across the back of the head and into the slots on the camshafts. With the bar in place, verify that the crankshaft position sensor is aligned with the tooth on the front pulley and that the line up bolt can be installed through the front pulley and into the timing cover. If things dont line up, the timing chain has jumped.
Potential Causes:
Jumped timing chain
** Confirmed Fix **
The timing chain had jumped
Tech Tips:
In this case the flat bar couldnt even line up with the slots in the camshafts.
---
This was one case out of MANY.
pHeeL tHiZ ViBe
Member
- :
- Mazdaspeed6
i would never have guessed, well i don't loose any more than 1qt every 4k miles
chriscecc914
Member
- :
- 06 MS6
so the cams were overtightened or torqued down wrong?
yea a rocker or shim or something...i dunno much about the head/cam components. May be timing but i dont think so. the machine shop went off the mazda specs as far as the installation so i dont know how they messed up.
Last edited:
forrestang
Member
Alot of times the shims will seat on a new motor, or the cams will settle in their journals and throw off the shims...
You obviously had a valve open at TDC...
This happens all the time on bikes when the shims are thrown out of spec...
I shimmed the valves on my old bike once....bucket/over shims.....I vowed to never do that again(coffee)
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