Question 1

How to remove and reinstall Camshaft in 3.6L V6 engine on Dodge Challenger?

Accepted Answer

Precautions are called for at this stage because the timing system is intricate and a simple error can result in engine blow up; it is cautioned that only experts should attempt this process and any doubts throw out to an expert. One must always be very careful and cross-check all work before starting of the engine. When the valve covers are off, the magnetic timing wheels can be seen and must not come in contact with other magnets or magnetic fields which will require replacement. Starting with the removal of the bad connection begin by removing the negative battery terminal and that on the 2015 and later that has the Intelligent Battery Sensor the IBS should be disconnected first. Lift the car well on the jackstands, drain the engine oil and coolant, and take of the drive belt, air cleaner housing, resonator, intake manifolds, exhaust system and head(s). All wires and vacuum hoses connected to the cylinder heads should be disconnected and then removed and labeled, the ignition coils and the spark plugs should also be removed and the coils labeled. Once the valve covers have been removed turn the crankshaft until the #1 piston is positioned at TDC on the exhaust side and the marks on the camshaft phaser are properly aligned. Identify the timing of the camshaft phasers and remove them from the engine for the reassembly, and by using special tools it is possible to hold the tensioner while the camshaft phasers are out without having to dismantled. Swivel both camshafts in anti-clockwise direction to a nominal position and unscrew and remove the cam bearing caps and take out the camshafts out of the head by lifting off action. Remove and refit the rocker arms and hydraulic lash adjusters and examine the surfaces of the camshaft bearing journals and lobe for damage and wear including the rocker's arms for signs of wear. When the technician is ready to start the engine, he or she must turn the crankshaft manually to look for some kind of opposition to rotation, which may cause problems. Hydraulic lash adjusters and rocker arms to be lubricated, and the cams to be fitted to the cylinder head carefully and the bearing caps to be bolted and tightened in a specific pattern. Check the position of the camshafts then fit the phasers and oil control valves in the right proper way properly torqued. Last but not the least, turn the engine to ensure that the alignment of marks is perfect and fix the vehicle in the reverse order to the removal process.

Question 2

How to remove Camshaft and Camshaft Bearing in 3.3L and 3.8L engine on Dodge Grand Caravan?

Accepted Answer

This procedure is for the 3.3/3.8 liter engine only and the engine must be taken out of the car and placed in an engine stand for the second half of the work. To confirm camshaft lobe lift with the cylinder head installed remove the valve cover(s), and with the number one piston at TDC on the compression stroke, Place the wide end of a dial indicator over the engine above the plunger and use the thin end to push the plunger up until it fits over the pushrod then zero the indicator, turn the crank slowly clockwise till the needle stops and goes down, this note the maximum cam lobe lift. Do this for the other rocker arms and remaining valves but make certain that each piston is at TDC on the compression stroke. If the lobe lift is lower than the specifications laid down then it is apparent that cam lobe wear has happened, in which case a replacement of the camshaft becomes necessary. Remove the cylinder head and then with the help of the micrometer measure the lobe height and base circle and then find the lobe lift by subtracting the value of base circle from the value of lobe height. For removal, take off the timing chain, sprockets, lifters as well as the push rods Next, take off the camshaft thrust plate, and the you use a long bolt to act as a handle to pull out the camshaft gently while supporting the bearings not to be damaged. Check the journals for wear, pitting or seizure etc. wash the same and by using micrometer find out whether the size has been increased due to excessive wear or out of round condition. Check the camshaft lobes for any signs of colour change, roughness, or dimensional change; if the lobes are in healthy condition and lobe lift measurements are within the limit, the camshaft can be reused. Lay obverses of bearings with block and using a small hole gauge and micrometer check inside diameter and calculate the oil clearance this must indicate that it is a new bearing. Again camshaft bearing replacement involves some specific tools and hence the block should be taken to auto machine shop for handling.

Question 3

What special tools are necessary to complete this procedure and what steps should be followed for camshaft installation in 3.7L V6 engine on Dodge Nitro?

Accepted Answer

As it is to be noted, special tools are required for the completion of this procedure and the reader is suggested to go through all the instructions before proceeding for the work, and then obtain the requisite tools. The camshafts should in all circumstances be professionally checked for suitability for use and camshaft end play should be measured before the camshafts are removed. First of all, unplug the cable from the negative terminal of the battery, and remove the valve covers. Turn the engine clockwise by the crankshaft pulley/vibration damper bolt with the "V6" marks on the camshaft sprockets adjusted to the 12 o'clock position. With a permanent marker, apply the alignment marks to the second timing chain link to the right of 'V6' marks on both camshaft sprockets. Using the spanner wrench grab the camshaft sprockets, and then remove the sprockets bolts and then again tighten the sprockets bolts but not to use any force. If the sprockets turn during this process, adjust them. Replace a timing chain tensioner wedge to lock the secondary chain and tensioner with the block during the removal of the camshaft; if both cams are removed, then the user should use two wedges. Remove the Camshaft position sensor and remove the Camshaft sprocket retaining bolts to come off the camshaft sprockets from the camshaft hubs. You should take some time and note down the positions of the camshaft bearing caps so that you will not mix them up and then slightly loosen the bearing cap bolts. Remove the bearing caps and label the rocker arms for reassembly place, remove the camshaft or camshafts and label them left or right, check if the camshaft Sprockets of wear, examine the chains of any crack suspect or conspicuous wear and examine the Camshaft bearing of any wear or damage. Check the OD of each Camshaft bearing journal and compare this with the ID of its corresponding bearing and all should be to a specified limit to define the oil clearance. Inspect camshaft run-out and end play and replace as required. Using a micrometer, compare camshaft lobe heights and the difference should not go beyond some standard level. During install, use a moly-based engine assembly lubricant on the camshaft lobes and journals before you put in the camshaft(s) with dowel pins at 10 o'clock position. Did some tightening of bearing caps, bolts to the specific torque which has to be followed carefully. Assemble the camshaft sprocket teeth into the camshaft drive chain links such that the "V6" mark fits into place. Thereafter, the camshaft sprocket bolts should be cleaned, the washers lubricated before the bolts are tightened to the desired torque. Last, before tightening the wedge(s), and reinstall the Camshaft Position Sensor, valve covers, reconnect the cable to the negative terminal of the battery.

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