* Rift over alleged corruption rocks centre-right coalition
* PM says will propose departure of two other ministers
(Adds PM saying two other ministers should leave)
PRAGUE, April 8 (Reuters) - The leader of a junior Czech coalition party quit the cabinet on Friday amid allegations of corruption, and the prime minister said he would propose that two other party ministers also quit.
Prime Minister Petr Necas said the coalition will survive, but did not say who would replace the three ministers.
Vit Barta, informal leader of the centrist Public Affairs party, resigned as transport minister but his party remained in the coalition, which has promised to cut the budget deficit and reform pensions and health care.
Public Affairs, which won 10.9 percent of the vote in last year's election, has been a destabilising factor in a coalition led by the Civic Democrats.
The government won investor confidence by pledging to balance the budget by 2016 and push through reforms, but its efforts have been hampered by a series of graft scandals and clashes within and between the three coalition parties.
Public Affairs is a newcomer in top politics after a May election elevated it to the government for the first time.
Its participation in the government has raised some eyebrows due to links between Barta and a private detective agency ABL that he used to own and which tailed politicians.
Media reports of alleged attempts by Barta to bribe party members to secure their loyalty caused a rift within the party and angered the other two coalition partners, Civic Democrats and TOP09.
Barta denied any wrongdoing and said he would resign.
Analysts have said Public Affairs may split up, but the coalition would still find enough support in the lower house to stay in power, although its ability to push through planned reforms would be hampered.
PROPOSED RESIGNATIONS
After a meeting of coalition leaders late on Friday, Necas said he would propose that along with Barta, two other Public Affair ministers, Interior Minister Radek John and Education Minister Josef Dobes, also leave the cabinet.
"With regards to the functioning of this government I consider it unacceptable that people that are linked directly or indirectly with company ABL or other intelligence service companies hold positions within the government of which I am the chairman," Necas told a news conference.
He said he would submit the proposed resignation of the two ministers as well as Barta's resignation to President Vaclav Klaus on Monday. The party would then be left with only one post in the cabinet, Regional Development Minister Kamil Jankovsky.
Public Affairs representatives left the meeting in protest.
In a statement, the party said the requirement for the departure of the other two of its ministers was unacceptable.
Necas had signalled, after accepting Barta's resignation, that there would be further changes to some cabinet posts.
Public Affairs expelled three dissenting members of its 24-strong parliamentary caucus this week, reducing the coalition's majority in the 200-seat lower house to 115.
The cabinet has already been weakened by several graft scandals, including allegations that Defence Minister Alexandr Vondra, a key ally of Necas, had overseen an overpriced services contract during the country's EU presidency in 2009.
Vondra denied any wrongdoing but coalition partners have been calling for his departure. (Reporting by Jana Mlcochova, Jan Lopatka and Robert Mueller; Editing by Andrew Heavens)