GMC 89017259 Cover Kit,Engine Front

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Begin by removing the cover, then isolate it from the negative battery cable. After that, remove fan shroud upper part, drive belt, fan/clutch assembly, water pump pulley, crankshaft pulley and hub. Remove the drive belt tensioner bracket and Timing Cover-to-engine block bolts next. Utilize a gasket scraper to erase any old gasket material and clean any of the sealing surfaces. To remove the timing chain; temporarily install crankshaft pulley hub and bolt; rotate crankshaft to align timing marks on crankshaft and camshaft sprockets; push back timing chain tensioner plunger and insert pin to retain plunger; using prybar holding engine while removing camshaft bolt; carefully prying camshaft sprocket off. Check for damage or wearout on timing chain and sprockets before replacing if necessary. Mesh new timing chains with camshafts; put them into engagement with crankshafts at their sprocket's teeth; aligning timing marks; installing tightening camshaft sprocket bolt; releasing tensioner; lubricating chain/sprocket; rotating engine to check alignment of timing marks; applying RTV sealant to oil pan sealing surface; finally securing front cover using new rubber seal.

Disconnecting the negative battery cable is the first step in removal and installation of the Timing Cover. To remove, you will have to remove upper and lower fan shrouds, drive belt, cooling fan and water pump. The number four piston must be positioned at TDC on the compression stroke, then remove the drive belt pulley and crankshaft damper. If applicable, don't forget to take out the crankshaft position sensor and wiring harness nut. Loosen front oil pan nuts before removing cover bolts when separating Timing Cover from block and breaking gasket seal if necessary. Note that for some engines, the front cover may be made of composite material and should be replaced rather than resealed. Just inside the front cover, pull off crankshaft position sensor reluctor ring which is attached to a camshaft sprocket and chain assembly. For an old gasket material use a gasket scraper to scrape it off; cleaning lacquer thinner or acetone should be wiped over sealing surfaces of engine cover and block; inspecting flange condition of a cover is recommended. Make sure that when installing a Woodruff key line up coincides with both crankshaft sprocket's as well as balance shaft gears'. Use clean engine oil to lubricate the chain; put Loctite on camshaft sprocket bolt threads before installing them tightly or tighten them after installing using Loctite. Apply RTV sealant in U-shaped channel on bottom side of the cover check oil pan-to-block joints; also check whether there are any leaks between housing halves in place where they meet with each other in front of timing chain area that is why you need to apply RTV sealant between them too. Thin layer of RTV sealant should be spread over both sides of new gasket so that it can be positioned on engine block by dowel pins thus holding it firmly in place. Finally install Timing Cover and tighten bolts taking into account whether it is necessary to remove or pry down oil pan for access. Lastly, apply moly-base grease or clean engine oil onto the vibration damper hub's oil seal contact surface, put the damper on the crankshaft, and proceed with other remaining installation steps including using new O-ring for crankshaft position sensor.

If you are dealing with a vehicle manufactured from 1995 onwards, then the V6 and small block V8 models will have non-reusable plastic front cover, which must be discarded as it cannot be reused after being removed to prevent any oil leaks. In contrast, for 7.4L V8 engines produced after 1996, there is a reusable front cover gasket and front cover that might only require a gasket replacement if the original one becomes damaged. The first step in removing the timing belt is removing the water pump, followed by unbolted crankshaft drivebelt pulley from the vibration damper. Once the number one piston is at TDC on the compression stroke, rotate crankshaft an additional 360 degrees giving caution not to turn it until when installing timing chain and sprockets. On most engines there is usually a large bolt threaded into the nose of the crank shaft used to secure the vibration damper and this necessitates its removal with a puller designed to apply force strictly on the damper hub so as not to damage it. When taking out the timing cover on certain V6s and small block V8s it may become necessary to loosen and drop down oil pan, requiring replacement of its gasket should it crack in this operation. Any accessories that obstruct access to timing chain cover should be removed or pushed away while on big block engines further steps include cutting oil pan gasket and remove cover. For 1995-present models remove crankshaft position sensor reluctor ring and for 7.4L engines there is special tool that's required for this purpose after which it must be replaced. One way of testing for timing chain free play is checking whether such play exceeds or falls below half inch and if so replace gears also. Next comes removing camshaft sprocket with chain assembly as a single unit; ensure proper alignment especially in cases where V6s or small block V8s have oil pan gasket deteriorated and so replace it. When it comes to gasket removal and surface cleaning, see if the cover flange needs any correction. Followed by, installing new parts like crankshaft sprocket, camshaft sprocket and vibration damper should be carried out with emphasis on correct alignment of keyways. For some engine types an application of lube oil is required while others must have sealant applied. Finally, the rest of the process is reversing the order in which these steps were taken.