No compression, CVVT timing?

Tiny
TONY SIZER
  • MEMBER
  • 2004 HYUNDAI ELANTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 160,000 MILES
The timing belt broke. Bent to intake valves, pulled the head and installed all new valves and valve seals. Put the head back on and reinstalled the intake and exhaust cam and chain. Now no compression in any cylinder. I set the crank shaft gear to its top d center also the front cam gear to its mark but just not sure about the CVVT cam timing marks. Or why no compression?
Monday, October 3rd, 2022 AT 1:41 AM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Sometimes you need to let the car sit for a while to allow time for the oil to bleed off inside the lifters, but in case here is how the timing marks should look for the camshaft sprocket and timing chain. I have included the instructions as well. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, October 3rd, 2022 AT 3:26 PM
Tiny
TONY SIZER
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  • 5 POSTS
I have all that info what I don't see is the timing marks on the CVVT exhaust cam and intake cam in the rear of the engine. Thanks for trying Ken. And I still don't know why no compression.
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Tuesday, October 4th, 2022 AT 4:15 PM
Tiny
KEN L
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Did you have a valve job done? Because if the valve height is not correct it will cause the valves not to close.
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Wednesday, October 5th, 2022 AT 4:40 PM
Tiny
TONY SIZER
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  • 5 POSTS
I was thinking the exact same thing Ken, because I bought the valves from Amazon, and I was wondering if they might be a different link stopping those dials from closing down.
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Wednesday, October 5th, 2022 AT 5:12 PM
Tiny
TONY SIZER
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I bought the valves from Amazon.
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Wednesday, October 5th, 2022 AT 5:13 PM
Tiny
KEN L
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  • 47,643 POSTS
Yep, I think this is your issue.
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Thursday, October 6th, 2022 AT 10:57 AM
Tiny
TONY SIZER
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  • 5 POSTS
Hello Ken, well, it seems that the new valves and the old ones are the same length.
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Sunday, October 9th, 2022 AT 12:44 PM
Tiny
KEN L
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Okay, I found the timing marks for the exhaust camshaft. When the engine is cranked over does the camshafts spin?
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Monday, October 10th, 2022 AT 11:19 AM
Tiny
TONY SIZER
  • MEMBER
  • 5 POSTS
Yes, it does and that is exactly how I lined up the timing sprocket timing marks.
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Tuesday, October 11th, 2022 AT 2:35 AM
Tiny
TONY SIZER
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Isn't there supposed to be some clearance between the cam lobes and lifters when the valves are shut?
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Tuesday, October 11th, 2022 AT 2:38 AM
Tiny
KEN L
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Yes, there is supposed to bae valve clearance, here is how to check it. Also check the images below.

5. Inspect the valve clearance
a. Check only the valve indicated as shown. [No. 1 cylinder: TDC/Compression] measure the valve clearance
Using a thickness gauge, measure the clearance between the tappet shim and the base circle of camshaft.
Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
Valve clearance
Specification
Engine coolant temperature: 20°C (68°F)
Intake: 0.20 mm (0.0079 inch)
Exhaust: 0.28 mm (0.0110 inch)
Engine coolant temperature: 80°C (176°F)
Intake: 0.29 mm (0.0114 inch)
Exhaust: 0.34 mm (0.0134 inch)
Limit
Intake: 0.12 - 0.28 mm (0.0047 - 0.0110 inch)
Exhaust: 0.20 - 0.38 mm (0.0079 - 0.0150 inch)
b. Turn the crankshaft pulley one revolution (360°) and align the groove with timing mark "T" of the lower timing belt cover.

I. Recheck the valve clearance.
Valve clearance (Engine coolant temperature: 20°C)
[Specification]
Intake: 0.20 mm (0.0079 inch)
Exhaust: 0.28 mm (0.011 inch)
[Limit] (After adjusting valve clearance)
Intake: 0.17 - 0.23 mm (0.0067 - 0.0091 inch)
Exhaust: 0.25 - 0.31 mm (0.0098 - 0.0122 inch)

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.
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Tuesday, October 11th, 2022 AT 12:26 PM

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