Custa um bom bocado mais e por favor, se virem alguém meter massa nos parafusos como nesse vídeo fujam.... é que ao meter massa ou qualquer outro lubrificante num parafuso, os apertos mudam, pois isso reduz a fricção, é assim que muito boa gente parte os parafusos e destrói roscas ao apertar cabeças, no manual de reparação no capitulo de reparação da cebeça diz especificamente isto:
t Cylinder heads with cracks between the valve seats may be used without reducing engine life, provided the cracks are small and not more than 0.5 mm wide.
t The cylinder heads of diesel engines must not be machined.
t Carefully remove any sealant residue from the cylinder head and cylinder block. Ensure that no long scores or scratches are made on the surfaces.
t Carefully remove any remaining emery and abrasive material.
t
No oil or coolant must be allowed to remain in the blind holes for the cylinder head bolts in the cylinder block.
t Renew the cylinder head bolts.
t Renew self-locking nuts and bolts when performing assembly work.
t Renew bolts which are tightened to a specified angle as well as oil seals and gaskets.
t Do not remove new cylinder head gasket from packaging until it is ready to be fitted.
t Handle gasket very carefully. Damage to the silicone coating or the indented area will lead to leaks.
t When installing an exchange cylinder head with fitted camshafts, the contact surfaces between roller rocker fingers and cams must be oiled after installing the head.
t The plastic protectors fitted to protect the open valves should not be removed until the cylinder head is ready to be fitted.
t After fitting a new cylinder head or cylinder head gasket, change the coolant and the engine oil.
t Adhere to the instructions for installing air pipes and hoses with plug-in connectors → Chapter.
t Secure all hose connections with the correct type of hose clips (same as original equipment) → Electronic parts catalogue.
– Check whether both the camshafts and the crankshaft are positioned at TDC:
l The grooves -arrows- for the parallel keys must face upwards.
Ao meter-se lubrificante numa rosca esta-se a retirar atrito, logo se aplicar-mos o mesmo aperto binário a força aplicada no proprio parafuso é muito superior e pode leva-lo a falhar e/ou a danificar a zona á volta(clássico partir na zona do parafuso no bloco dos 1.9/2.0!), só se usa lubrificante se houver nitidamente um aviso do fabricante para o usar, caso contrario os apertos devem ser sempre feitos a seco com obviamente as roscas todas limpas e parafusos elasticos novos, os parafusos já tem um tratamento para assegurar a fricção adequada.
No vídeo é um 16v, não é um motor bmp como do amigo ovelheiro.