Need to remove heads to remove broken header bolts, they broke on their own. I want to know if I have to set motor at TDC.
WAIT!!!!!! 2 Options- Easy Way or Hard Way, I'll post pitiful the easy way! See pictures below but read the hard way too as it's not nearly as hard as people say, just do your research first but option 2 in the pictures I've attached to this answer is so much easier and just as effective!
1,) If you have broken exhaust manifold bolts(same for headers if you have them) there's no reason to worry about head removal or anything remotely close to TDC. That won't apply to this project. You'll have to remove the front wheels & inner fenders which are plastic. This allows easy access to the exhaust bolts. You must drill them out and I suggest a Ez-Out tool or broken bolt extractor, a left handed drill bit could be helpful too. Either way you go, no need to do all of that extra work for nothing. TDC is relevant when setting a vehicle's timing, yours wouldn't be affected by removing the cylinder heads anyway. Just do it with the motor intact and in the vehicle, see one of the many YouTube videos on this- it's not bad at all! Let me know if I've been helpful by vibking the Green Button and have a great day!
2.) See Attached Pics and then amazon through the link provided to learn more, the customer reviews are particularly helpful!
SOURCE: 2003 yukon denali. Speedometer broke. What needs
can you be more specific than "broke"...... does the odometer work? do all the other gauges work? if not, are they accurate.
SOURCE: are the removal bolts on the brake caliper the 5/8
All newer GM vehicles bolts would be metric mm
SOURCE: i need to know where is the #1 spark plug on a 1998 gmc yukon
V8 engine? That would be drivers side front. Remember that TDC is number one piston up (On the compression stroke, not exhaust stroke), timing marks at zero.
SOURCE: I have a 2003 gmc envoy SLT 4.2 L6, and need to
Check this procedure.... Timing Chain & Sprockets-Removal & Installation for 4.2L Engine
Fig. Proper installation of the crankshaft holding tool with the No. 1 cylinder at TDC (click image for zoom)
Fig. Rotate the camshaft actuator clockwise
Fig. The dark lines on the timing chain should be aligned with the marks on the sprockets
NOTE
The following procedure requires the use of the Crankshaft Holding tool No. J-44221 and a suitable torque angle meter.
To install:
Camshaft cover
Timing chain (front) cover
Tension on the timing chain by moving the tensioner shoe in. Place a tee into the tension to hold the shoe in place.
Top chain guide bolts and guide
Exhaust camshaft position actuator bolt and actuator
Intake camshaft sprocket bolt and sprocket
Timing chain
Crankshaft sprocket
Cylinder head access hole plugs
Timing chain tensioner shoe bolt and shoe
Timing chain tensioner guide bolts and guide
Timing chain tensioner bolts and tensioner
NOTE
Every seventh link of the timing chain is darkened to help in aligning the timing marks.
Timing chain tensioner and bolts. Tighten to 18 ft. lbs. (25 Nm).
Timing chain guide and bolts. Tighten to 89 inch lbs. (10 Nm).
Timing chain tensioner shoe and bolt. Tighten to 19 ft. lbs. (26 Nm).
Cylinder head access hole plugs and tighten to 44 inch lbs. (5 Nm)
Crankshaft Holding tool No. J-44221, or equivalent with the camshaft flats up and the No. 1 cylinder at Top Dead Center (TDC)
Crankshaft sprocket
Intake camshaft sprocket into the timing chain
NOTE
It may be necessary to remove the crankshaft holding tool to
rotate and hold the camshaft hex to align the pin to the camshaft
sprocket
NOTE
It may be necessary to remove the crankshaft holding tool to
rotate and hold the camshaft hex to align the pin to the camshaft
sprocket
NOTE
Rotate the camshaft actuator clockwise relative to the camshaft prior to tightening the bolt.
Timing chain onto the crankshaft sprocket. Align the dark link of
the timing chain with the timing mark on the crankshaft sprocket.
Intake camshaft sprocket onto the intake camshaft
Intake camshaft washer and bolt
Exhaust camshaft actuator into the timing chain. Align the dark
link of the timing chain with the timing mark on the exhaust camshaft
actuator.
Exhaust camshaft actuator onto the exhaust camshaft
WARNING
The camshaft actuator must be fully advanced during installation.
Engine damage may occur if the camshaft actuator is not fully advanced.
Top chain guide
Suitable threadlock to the top chain guide bolt threads, then install and tighten to 89 inch lbs. (10 Nm)
Engine front cover
Camshaft cover
continue...
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